WO2002052757A1 - Adaptive pilot/traffic channel power control for 3gpp wcdma - Google Patents

Adaptive pilot/traffic channel power control for 3gpp wcdma Download PDF

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Publication number
WO2002052757A1
WO2002052757A1 PCT/US2001/050552 US0150552W WO02052757A1 WO 2002052757 A1 WO2002052757 A1 WO 2002052757A1 US 0150552 W US0150552 W US 0150552W WO 02052757 A1 WO02052757 A1 WO 02052757A1
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Prior art keywords
power ratio
reference power
dpcch
recited
power
Prior art date
Application number
PCT/US2001/050552
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French (fr)
Inventor
Robert C. Qiu
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Wiscom Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to CA002436042A priority Critical patent/CA2436042A1/en
Priority to EP01992407A priority patent/EP1354433A1/en
Publication of WO2002052757A1 publication Critical patent/WO2002052757A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/288—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the usage mode, e.g. hands-free, data transmission, telephone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • This invention relates to the field of wireless digital communications, and more particularly to gain factors.
  • Wireless communications facilitates the delivery of information between the transmitter and the receiver without a physical wired connection.
  • Such advantage translates to the freedom of mobility for the users and to the savings of wiring nuisance for the users.
  • spectrum has become scarce resource as the usage of wireless communications for various applications becomes more popular. Therefore the efficiency of using spectrum presents challenges for the wireless industry.
  • various multiple access methods have been proposed to achieve the goal.
  • First generation cellular communications systems Advanced Mobile Phone
  • AMPS Frequency Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • CDMA Code Division Multiple Access
  • Second generation cellular communications systems improved the spectrum efficiency by using more digital processing of signals and employed Time Division Multiple Access (TDMA) method in GSM and IS-136 systems and Code Division Multiple Access (CDMA) method in IS-95 systems. While second generation systems typically provide two to five times voice capacity over the first generation systems, data capabilities of second-generation systems are very limited. Recent rapid commercial development of Internet and multimedia applications has created a strong demand for wireless cellular systems capable of providing sufficient bandwidth. In addition, further improvement of voice capacity in spectrum efficiency is in great demand as the spectrum allocated for service is very limited. This scarcity results in high licensing fees for the available spectrum.
  • the present invention is a method and system to determine the gain factors for the uplink and downlink Dedicated Physical Control Channel (DPCC) and Dedicated Physical Data Channel (DPDC).
  • DPCC uplink and downlink Dedicated Physical Control Channel
  • DPDC Dedicated Physical Data Channel
  • FIG. 1 is a functional block diagram.
  • the present invention is equally well suited for both uplink of WCDMA as well as other similar systems like CDMA2000.
  • One feature of the present invention is a method and system to determine the gain factors for the uplink and downlink DPDCH and DPCCH. This method and system is equally well suited for Physical Random
  • PRACH Physical Access Channel
  • DPCCH Downlink Dedicated Physical Control Channel
  • DPDCH Dedicated Physical Data Channel
  • the gain factors ⁇ c and ⁇ d are important to 3GPP WCDMA system performance like capacity.
  • the initial uplink DPCCH transmit power is set by higher layers. Subsequently the uplink transmit power control procedure simultaneously controls the power of a
  • the relative transmit power offset between DPCCH and DPDCHs is determined by the network and is computed using the gain factors signaled to the User Equipment (UE) using higher layer signaling.
  • UE User Equipment
  • TFCs Transport Format Combinations
  • Combinations of the two above methods may be used to associate ⁇ c and ⁇ d values to all TFCs in the TFCS.
  • the operation of the inner power control loop adjusts the power of the DPCCH and DPDCHs by the same amount, provided there are no changes in gain factors. Additional adjustments to the power of the DPCCH associated with the use of compressed mode.
  • Any change in the uplink DPCCH transmit power shall take place immediately before the start of the pilot field on the DPCCH.
  • the change in DPCCH power with respect to its previous value is derived by the User Equipment and is denoted by ⁇ DPCC H (in dB).
  • the previous value of DPCCH power shall be that used in the previous slot, except in the event of an interruption in transmission due to the use of compressed mode, when the previous value shall be that used in the last slot before the transmission gap.
  • the User Equipment transmit power shall not exceed a maximum allowed value which is the lower out of the maximum output power of the terminal power class and a value which may be set by higher layer signaling. Uplink power control shall be performed while the User Equipment transmit power is below the maximum allowed output power. If the User Equipment transmit power is below the required minimum output power [as defined in TS 25.101] and the derived value of ⁇ DPCCH is less than zero, the User Equipment may reduce the magnitude of ⁇ D PC CH- The User Equipment shall scale the total transmit power of the DPCCH and
  • DPDCH(s) such that the DPCCH output power follows the changes required by the power control procedure with power adjustments of ⁇ DPCCH dB, unless this would result in a User Equipment transmit power above the maximum allowed power.
  • the User Equipment shall scale the total transmit power so that it is equal to the maximum allowed power.
  • the gain factors during compressed frames are based on the nominal power relation defined in normal frames.
  • the gain factors ⁇ c and ⁇ are signaled by higher layers for a certain TFC, the signaled values are used directly for weighting of DPCCH and DPDCH(s).
  • the variable A j called the nominal power relation is then computed as:
  • each TFC has a unique data rate connected with a unique pair of gain factors for the DPCCH and DPDCH.
  • the change of gain factors for DPCCH and DPDCH are performed to keep constant the transmitted bit energy E D (before coding) on the DPDCH, independent of the data rate.
  • the DPCCH power is kept constant to avoid affecting the transmit power control (TPC). If the power ratio between DPDCH and DPCCH goes wrong, the TPC loop operating based on DPCCH will degrade the WCDMA system performance.
  • the present invention provides a method and system to determine the gain factors for the uplink DPDCH and DPCCH.
  • Equation 2 A key concept of the present invention is to link up the nominal power relation in Equation 1 with both system and radio channel parameters through the closed form relationship given by Equation 2.
  • Fig. 1 there can be seen an illustration of the use of the present invention in the form of a functional block diagram to set up the normalized reference power ratio.
  • Step 102 we use the corresponding reference power ratio for voice (Most times the system parameters are optimized for voice performance and for a WCDMA system the initial focus is voice applications) as the initial value of Po.
  • step 104 The data rate in step 104 is given.
  • step 106 the necessary system and radio channel parameters necessary for Equation 2 are given.
  • the normalized reference power ratio is determined in step 110.
  • Steps 104 through 110 are dynamically repeated for new data rate.
  • the dynamic nature of the radio channel is directly related to the dynamic nature of the DPDCH data channel. Therefore the present invention responds quickly to the radio channel of the air interface while the mobile terminal is moving around. No simple scheme in power settings can be accurate without dynamic response to the real-time radio channel being experienced by the DPDCH data channel and the DPCCH channel.
  • this scheme can be regarded as the adaptive scheme for the system to set up the resources to make certain that the WCDMA system works at an optimal state.
  • the significance of this method is the speed of the quick convergence. Although it may not be so accurate for some working conditions, the method is Fig. 1 dynamically adjust the nominal power relation quickly. Thus the system is always working at the quasi-optimal system settings.
  • One result of the net advantages of this method is that the system resource or system power is not wasted and thus the interference is minimized.
  • CDMA2000 One feature of the present invention is a method and system to determine the gain factors for the uplink and downlink DPDCH and DPCCH. This method and system is equally well suited for Physical Random Access Channel (PRACH) message part. Accordingly, this description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the best mode of carrying out the invention. Details of the structure may be varied substantially without departing from the spirit of the invention, and the exclusive use of all modifications, which come within the scope of the appended claim, is reserved.
  • PRACH Physical Random Access Channel

Abstract

The present invention is a method (figure 1) and system to determine the gain factors for the uplink and downlink Dedicated Physical Control Channel (DPCC) and Dedicated Physical Data Channel (DPDC). The method consists of determining new data rate (104) for transmission; providing corresponding system and radio channel parameters (106); determining reference power ratio P1 (108); and, normalizing the reference power ratio (110).

Description

ADAPTIVE PILOT/TRAFFIC CHANNEL POWER CONTROL FOR 3GPP
WCDMA
FIELD OF THE INVENTION
This invention relates to the field of wireless digital communications, and more particularly to gain factors.
BACKGROUND OF THE INVENTION
Wireless communications facilitates the delivery of information between the transmitter and the receiver without a physical wired connection. Such advantage translates to the freedom of mobility for the users and to the savings of wiring nuisance for the users. However, spectrum has become scarce resource as the usage of wireless communications for various applications becomes more popular. Therefore the efficiency of using spectrum presents challenges for the wireless industry. In order to maximize efficient spectrum utilization, various multiple access methods have been proposed to achieve the goal. First generation cellular communications systems, Advanced Mobile Phone
Services (AMPS) employed the Frequency Division Multiple Access (FDMA) method and provided voice communication services in the early days. Second generation cellular communications systems improved the spectrum efficiency by using more digital processing of signals and employed Time Division Multiple Access (TDMA) method in GSM and IS-136 systems and Code Division Multiple Access (CDMA) method in IS-95 systems. While second generation systems typically provide two to five times voice capacity over the first generation systems, data capabilities of second-generation systems are very limited. Recent rapid commercial development of Internet and multimedia applications has created a strong demand for wireless cellular systems capable of providing sufficient bandwidth. In addition, further improvement of voice capacity in spectrum efficiency is in great demand as the spectrum allocated for service is very limited. This scarcity results in high licensing fees for the available spectrum.
Therefore there is a strong need to improve the system capacity and spectrum efficiency for wireless communication systems.
SUMMARY OF THE INVENTION
The present invention is a method and system to determine the gain factors for the uplink and downlink Dedicated Physical Control Channel (DPCC) and Dedicated Physical Data Channel (DPDC).
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete understanding of the present invention may be obtained from consideration of the following description in conjunction with the drawing in which Fig. 1 is a functional block diagram.
DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT
The present invention is equally well suited for both uplink of WCDMA as well as other similar systems like CDMA2000. One feature of the present invention is a method and system to determine the gain factors for the uplink and downlink DPDCH and DPCCH. This method and system is equally well suited for Physical Random
Access Channel (PRACH) message part. The uplink Dedicated Physical Control Channel (DPCCH) and Dedicated Physical Data Channel (DPDCH) are transmitted on different codes. The gain factors βc and βd are important to 3GPP WCDMA system performance like capacity.
The initial uplink DPCCH transmit power is set by higher layers. Subsequently the uplink transmit power control procedure simultaneously controls the power of a
DPCCH and its corresponding DPDCHs (if present). The relative transmit power offset between DPCCH and DPDCHs is determined by the network and is computed using the gain factors signaled to the User Equipment (UE) using higher layer signaling.
There are two ways of controlling the gain factors of the DPCCH code and the DPDCH codes for different Transport Format Combinations (TFCs) in normal (non- compressed) frames:
- βc and βd are signalled for the TFC, or
- βc and βd is computed for the TFC, based on the signalled settings for a reference TFC.
Combinations of the two above methods may be used to associate βc and βd values to all TFCs in the TFCS. The gain factors may vary on radio frame basis (1 radio frame = 10 ms) depending on the current TFC used. Further, the setting of gain factors is independent of the inner loop power control.
The operation of the inner power control loop, adjusts the power of the DPCCH and DPDCHs by the same amount, provided there are no changes in gain factors. Additional adjustments to the power of the DPCCH associated with the use of compressed mode. Any change in the uplink DPCCH transmit power shall take place immediately before the start of the pilot field on the DPCCH. The change in DPCCH power with respect to its previous value is derived by the User Equipment and is denoted by ΔDPCCH (in dB). The previous value of DPCCH power shall be that used in the previous slot, except in the event of an interruption in transmission due to the use of compressed mode, when the previous value shall be that used in the last slot before the transmission gap.
During the operation of the uplink power control procedure the User Equipment transmit power shall not exceed a maximum allowed value which is the lower out of the maximum output power of the terminal power class and a value which may be set by higher layer signaling. Uplink power control shall be performed while the User Equipment transmit power is below the maximum allowed output power. If the User Equipment transmit power is below the required minimum output power [as defined in TS 25.101] and the derived value of ΔDPCCH is less than zero, the User Equipment may reduce the magnitude of ΔDPCCH- The User Equipment shall scale the total transmit power of the DPCCH and
DPDCH(s), such that the DPCCH output power follows the changes required by the power control procedure with power adjustments of ΔDPCCH dB, unless this would result in a User Equipment transmit power above the maximum allowed power. In this case the User Equipment shall scale the total transmit power so that it is equal to the maximum allowed power.
The gain factors during compressed frames are based on the nominal power relation defined in normal frames. When the gain factors βc and β are signaled by higher layers for a certain TFC, the signaled values are used directly for weighting of DPCCH and DPDCH(s). The variable Aj, called the nominal power relation is then computed as:
A = — Equation 1.
Typically each TFC has a unique data rate connected with a unique pair of gain factors for the DPCCH and DPDCH. The change of gain factors for DPCCH and DPDCH are performed to keep constant the transmitted bit energy ED (before coding) on the DPDCH, independent of the data rate. The DPCCH power is kept constant to avoid affecting the transmit power control (TPC). If the power ratio between DPDCH and DPCCH goes wrong, the TPC loop operating based on DPCCH will degrade the WCDMA system performance.
The present invention provides a method and system to determine the gain factors for the uplink DPDCH and DPCCH.
Figure imgf000007_0001
In Equation 2, m represents number of paths, P represents reference power ratio, Ro represents cutoff rate, ro represents coding rate, Bn represents the noise bandwidth, and, Rb represents information bit rate. A key concept of the present invention is to link up the nominal power relation in Equation 1 with both system and radio channel parameters through the closed form relationship given by Equation 2. Referring to the functional diagram in Fig. 1 there can be seen an illustration of the use of the present invention in the form of a functional block diagram to set up the normalized reference power ratio. By using an example the working principle behind the present invention can be better illustrated. In Step 102 we use the corresponding reference power ratio for voice (Most times the system parameters are optimized for voice performance and for a WCDMA system the initial focus is voice applications) as the initial value of Po. When the system is required to serve a new data rate, say r=384kbps, we need to figure out what the new nominal power relation in Equation 1. The method illustrated in Fig. 1 is used to obtain the new A). This new At can be used by the system to set up the signaled gain factors for the reference TFC. The settings can be sent through higher layers for a certain TFC. What really matters is the relative settings of one data rate to another initial data rate such as a voice channel. The relative settings play an important role in "'calibrating" the system settings. If there is a system error in Equation 2, this scaling can reduce the error such that the relative settings can more accurately describe the functional relationship between one DPDCH data channel and another DPDCH data channel. In step 102 an initial value is given to A0. The data rate in step 104 is given. In step 106 the necessary system and radio channel parameters necessary for Equation 2 are given. The reference power ratio Pι=P is solved using Equation 2 in step 108. The normalized reference power ratio is determined in step 110. Steps 104 through 110 are dynamically repeated for new data rate. In the present invention, the dynamic nature of the radio channel is directly related to the dynamic nature of the DPDCH data channel. Therefore the present invention responds quickly to the radio channel of the air interface while the mobile terminal is moving around. No simple scheme in power settings can be accurate without dynamic response to the real-time radio channel being experienced by the DPDCH data channel and the DPCCH channel. Thus this scheme can be regarded as the adaptive scheme for the system to set up the resources to make certain that the WCDMA system works at an optimal state. The significance of this method is the speed of the quick convergence. Although it may not be so accurate for some working conditions, the method is Fig. 1 dynamically adjust the nominal power relation quickly. Thus the system is always working at the quasi-optimal system settings. One result of the net advantages of this method is that the system resource or system power is not wasted and thus the interference is minimized. These two interacting factors both lead to higher system throughput or system capacity.
In view of the foregoing description, numerous modifications and alternative embodiments of the invention will be apparent to those skilled in the art. The present invention is equally well suited for both uplink of WCDMA and similar systems like
CDMA2000. One feature of the present invention is a method and system to determine the gain factors for the uplink and downlink DPDCH and DPCCH. This method and system is equally well suited for Physical Random Access Channel (PRACH) message part. Accordingly, this description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the best mode of carrying out the invention. Details of the structure may be varied substantially without departing from the spirit of the invention, and the exclusive use of all modifications, which come within the scope of the appended claim, is reserved.

Claims

I claim:
1. A method for adaptive pilot/traffic channel power control in a CDMA communication system, the method comprising Ijhe following steps: determining new data rate for transmission; providing corresponding system and radio channel parameters; determining reference power ratio Pi; and, normalizing the reference power ratio.
2. The method as recited in claim 1 further comprising the step of assigning an initial power ratio An.
3. The method as recited in claim 2 wherein said initial power ratio Ao is for voice.
4. The method as recited in claim 1 wherein the reference power ratio is determined by
Figure imgf000010_0001
wherein m represents number of paths; P represents reference power ratio; Ro represents cutoff rate; ro represents coding rate; B„ represents the noise bandwidth; and, Rb represents information bit rate.
5. The method as recited in claim 1 wherein the normalized reference power ratio is determined by A, = (Pι/P0)*Ao.
6. The method as recited in claim 1 further comprising repeating the steps for each new data rate.
7. The invention as substantially described and shown herein.
PCT/US2001/050552 2000-12-22 2001-12-21 Adaptive pilot/traffic channel power control for 3gpp wcdma WO2002052757A1 (en)

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