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Method, apparatus and computer program for power control related to random access procedures

A power control and power technology, applied in power management, wireless communication, electrical components, etc., can solve unknown problems

Active Publication Date: 2011-04-13
NOKIA NETWORKS OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, and as mentioned above, it turns out that if the UE uses the PUSCH PC formula for sending message 3, the power used by the UE to transmit message 3 is unknown to the eNB

Method used

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  • Method, apparatus and computer program for power control related to random access procedures
  • Method, apparatus and computer program for power control related to random access procedures
  • Method, apparatus and computer program for power control related to random access procedures

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Embodiment Construction

[0049] In the specific examples given below, the embodiments address the problem of how to use the power control formulas for PUSCH and PUCCH during or after the random access procedure.

[0050] To the best of the inventor's knowledge, this problem has not been solved before. The operation according to 3GPP TS 36.213v.8.2.0 (attached as evidence B to the priority document) is to transmit message 3 using the PUSCH PC formula considering the PC command received from the eNB in ​​message 2 (see Figures 1B and 1C) (See Figure 1B). However, this does not detail how the UE-specific parameters of the PUSCH and PUCCH power control equations are initialized.

[0051] The PUSCH PC formula for the UE in the i-th subframe is defined in Section 5.1.1.1 of 3GPP TS 36.213 v8.2.0 as follows:

[0052] P PUSCH (i)=min{P MAX , 10log 10 (M PUSCH (i))+P O_PUSCH (j)+α·PL+Δ TF (TF(i))+f(i)}(dBm);[1]

[0053] in,

[0054] ●P MAX is the maximum allowed power related to UE power class.

[...

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Abstract

A first power control adjustment state g(i) and a second power control adjustment state f(i) are initialized for i=0 to each reflect an open loop power control error. An initial transmit power for a shared uplink channel is computed using full pathloss compensation. The computed initial transmit power depends on a preamble power of a first message sent on an access channel, and the initial transmit power is initialized with the second power control adjustment state f(0). A third message is sent from a transmitter on an uplink shared channel at the initial transmit power. In various implementations, the power for i=0 on the uplink control channel is also initialized similar to the initial transmit power for the third message and using full pathloss compensation, and after the third message (and retransmissions of it), subsequent messages sent on the uplink shared channel are sent at a power that is computed using fractional pathloss compensation.

Description

technical field [0001] The exemplary and non-limiting embodiments of the present invention relate generally to wireless communication systems, methods, devices and computer programs, and more particularly to techniques for power controlling different uplink messages sent from a communication device. Background technique [0002] Various abbreviations appearing in this specification and / or drawings are defined as follows: [0003] 3GPP Third Generation Partnership Project [0004] DL downlink [0005] DRX discontinuous reception [0006] eNB EUTRAN Node B (evolved Node B) [0007] EUTRAN Evolved UTRAN (also known as LTE) [0008] LTE Long Term Evolution [0009] MAC Medium Access Control [0010] MME Mobility Management Entity [0011] Node B base station [0012] OFDMA Orthogonal Frequency Division Multiple Access [0013] PC power control [0014] PDCCH Physical Downlink Control Channel [0015] PDCP Packet Data Convergence Protocol [0016] PDSCH physical downl...

Claims

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Application Information

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IPC IPC(8): H04W52/00
CPCH04W52/10H04W52/242H04W52/50H04W52/16H04W52/146
Inventor J·科霍南J·O·林德霍尔姆
Owner NOKIA NETWORKS OY
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