# US 7,613,159 B2 · Transmission power level estimation

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- Number: US 7,613,159 B2
- Document ID: US7613159B2
- Status: Granted
- Kind: B2
- Application number: 11/044,092
- Filed: 2005-01-27
- Published: 2005-08-04
- Granted: 2009-11-03
- Earliest claimed: 2001-05-15
- Assignees: InterDigital Technology Corporation
- Inventors: Eldad Zeira; Guodong Zhang
- Web page: https://patentgrep.com/patent/US7613159B2

## CPC

- H04W 28/16: Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04B 17/346: {Noise values (signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336)}
- H04B 17/347: {Path loss}
- H04B 17/373: Predicting channel quality {or other radio frequency [RF]} parameters
- H04B 17/382: for resource allocation, admission control or handover
- H04W 52/226: {using past references to control power, e.g. look-up-table}
- H04W 52/228: {using past power values or information}
- H04W 52/241: {taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo}
- H04W 52/242: {taking into account path loss}
- H04W 52/243: {taking into account interferences}
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04B 17/327: Received signal code power [RSCP]
- H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336)
- H04W 52/16: Deriving transmission power values from another channel
- H04W 52/246: {where the output power of a terminal is based on a path parameter calculated in said terminal}
- H04W 52/34: TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

A transmission power level of a selected user is estimated in a code division multiple access (CDMA) communication system. An initial estimate of a transmit power level associated with the selected user is determined. A transmit power level of users of the system other than the selected user is provided. Subsequent estimates for the selected user and the other users are estimated using previous transmit power level estimates of the selected user and the other users. The estimating subsequent estimates is repeated with a last repetition's estimated transmit power levels for the selected and other users being the estimated transmit power levels of the selected and other users.

## Claims

### Claim 1

A method for determining transmission power levels after admission of a new user in code division multiple access (CDMA) communications, the method comprising:
determining an initial estimate of a first transmit power level by a radio network controller (RNC), wherein the first transmit power level is associated with the new user;
providing estimates of a second transmit power level by the RNC, wherein the second transmit power level is associated with each of the existing users;
generating subsequent estimates for the first transmit power level and the second transmit power level using previous estimates of the first transmit power level and the second transmit power level; and
repeatedly generating subsequent estimates with a last repetition's estimates for the first transmit power level and the second transmit power level, the subsequent estimates being generated until the estimated first transmit power level and the estimated second transmit power level converge, wherein convergence of the estimated transmit power levels is determined by the equation

T
K
+
1
⁡
(
i
)
-
T
K
⁡
(
i
)

T
K
⁡
(
i
)
≤
δ
wherein T is the transmit power level, i is an index for each user between 1 and M+1, M is a number of existing users, M+1 identifies the new user, K is a number of estimations of the transmit power level for user i, and δ is a convergence parameter.

### Claim 2 (depends on 1)

The method of claim 1 wherein the initial estimate of the first transmit power level is determined using an estimated pathloss between the new user and a base station of the new user, an interference estimate and a desired signal to interference ratio.

### Claim 3 (depends on 2)

The method of claim 2 wherein the interference estimate is a measure of interference signal code power of the new user.

### Claim 4 (depends on 2)

The method of claim 2 wherein the interference estimate is a measure of interference signal code power of users located a similar distance from the base station as the new user.

### Claim 5 (depends on 2)

The method of claim 2 wherein the estimated pathloss is a difference between a received power level and the first transmit power level.

### Claim 6 (depends on 2)

The method of claim 2 wherein the estimated pathloss is determined by a pathloss of users located a similar distance from the base station as the new user.

### Claim 7 (depends on 1)

The method of claim 1 wherein the generating subsequent estimates includes using an estimated pathloss between users of cells other than a cell of the new user and the base station of the new user, an interference estimate and a desired signal to interference ratio.

### Claim 8 (depends on 7)

The method of claim 7 wherein the interference estimate is determined by summing a transmit power level of users of cells other than a cell of the new user divided by a pathloss between the other cell user and the other cell user's base station.

### Claim 9

A radio network controller (RNC) for determining transmission power levels after admission of a new user in code division multiple access (CDMA) communications, the RNC comprising:
a determining device configured to determine an initial estimate of a first transmit power level, wherein the first transmit power level is associated with the new user;
a providing device configured to provide estimates of a second transmit power level, wherein the second transmit power level is associated with each of the existing users;
an estimating device configured to generate subsequent estimates for the first transmit power level and the second transmit power level using previous estimates of the first transmit power level and the second transmit power level; and
said estimating device further configured to repeatedly generate subsequent estimates with a last repetition's estimates for the first transmit power level and the second transmit power level, the subsequent estimates being generated until the estimated first transmit power level and the estimated second transmit power level converge, wherein convergence of the estimated transmit power levels is determined by the equation

T
K
+
1
⁡
(
i
)
-
T
K
⁡
(
i
)

T
K
⁡
(
i
)
≤
δ
wherein T is the transmit power level, i is an index for each user between 1 and M+1, M is a number of existing users, M+1 identifies the new user, K is a number of estimations of the transmit power level for user i, and δ is a convergence parameter.

### Claim 10 (depends on 9)

The RNC of claim 9 wherein the initial estimate of the first transmit power level is determined using an estimated pathloss between the new user and a base station of the new user, an interference estimate and a desired signal to interference ratio.

### Claim 11 (depends on 10)

The RNC of claim 10 wherein the interference estimate is a measure of interference signal code power of the new user.

### Claim 12 (depends on 10)

The RNC of claim 10 wherein the interference estimate is a measure of interference signal code power of users located a similar distance from the base station as the new user.

### Claim 13 (depends on 10)

The RNC of claim 10 wherein the estimated pathloss is a difference between a received power level and the first transmit power level.

### Claim 14 (depends on 9)

The RNC of claim 9 wherein the estimated pathloss is determined by a pathloss of users located a similar distance from the base station as the new user.

### Claim 15 (depends on 9)

The RNC of claim 9 wherein said estimating device is configured to use an estimated pathloss between users of cells other than a cell of the new user and the base station of the new user, an interference estimate and a desired signal to interference ratio.

### Claim 16 (depends on 15)

The RNC of claim 15 wherein the interference estimate is determined by summing a transmit power level of users of cells other than a cell of the new user divided by a pathloss between the other cell user and the other cell user's base station.

### Claim 17

A radio network controller (RNC) for determining transmission power levels after admission of a new user in code division multiple access (CDMA) communications, the RNC comprising:
a radio resource management device configured to:
determine an initial estimate of a first transmit power level, wherein the first transmit power level is associated with the new user;
provide estimates of a second transmit power level, wherein the second transmit power level is associated with each of the existing users;
generate subsequent estimates for the first transmit power level and the second transmit power level using previous estimates of the first transmit power level and the second transmit power level; and
repeatedly generate subsequent estimates with a last repetition's estimates for the first transmit power level and the second transmit power level, the subsequent estimates being generated until the estimated first transmit power level and the estimated second transmit power level converge, wherein convergence of the estimated transmit power levels is determined by the equation

T
K
+
1
⁡
(
i
)
-
T
K
⁡
(
i
)

T
K
⁡
(
i
)
≤
δ
wherein T is the transmit power level, i is an index for each user between 1 and M+1, M is a number of existing users, M+1 identifies the new user, K is a number of estimations of the transmit power level for user i, and δ is a convergence parameter.

### Claim 18 (depends on 17)

The RNC of claim 17 wherein the initial estimate of the first transmit power level is determined using an estimated pathloss between the new user and a base station of the new user, an interference estimate and a desired signal to interference ratio.

### Claim 19 (depends on 18)

The RNC of claim 18 wherein the interference estimate is a measure of interference signal code power of the new user.

### Claim 20 (depends on 18)

The RNC of claim 18 wherein the interference estimate is a measure of interference signal code power of users located a similar distance from the base station as the new user.

### Claim 21 (depends on 18)

The RNC of claim 18 wherein the estimated pathloss is a difference between a received power level and the first transmit power level.

### Claim 22 (depends on 18)

The RNC of claim 18 wherein the estimated pathloss is determined by a pathloss of users located a similar distance from the base station as the new user.

### Claim 23 (depends on 17)

The RNC of claim 17 wherein the generating subsequent estimates includes using an estimated pathloss between users of cells other than a cell of the new user and the base station of the new user, an interference estimate and a desired signal to interference ratio.

### Claim 24 (depends on 23)

The RNC of claim 23 wherein the interference estimate is determined by summing a transmit power level of users of cells other than a cell of the new user divided by a pathloss between the other cell user and the other cell user's base station.