Codebook restructure, differential encoding/decoding, and scheduling

A difference, codebook technology, applied in the direction of digital transmission system, baseband system, electrical components, etc., can solve the problem of limited uplink bandwidth and so on

Active Publication Date: 2012-10-03
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such additional data transmission represents feedback overhead due to the limited uplink bandwidth between the mobile station and the base station

Method used

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  • Codebook restructure, differential encoding/decoding, and scheduling
  • Codebook restructure, differential encoding/decoding, and scheduling
  • Codebook restructure, differential encoding/decoding, and scheduling

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0126] According to a first example, the base station 14 may schedule transmission of the primary identifier during a first transmission time period and may schedule transmission of the differential identifier during a second time period, wherein the second time period is subsequent to the first time period. The time period may be based on the uplink subframe data transmission rate between the mobile station 16 and the base station 14 . In one embodiment, each T subframes periodically schedule the transmission of the primary identifier (i.e. separated by the first predetermined time interval T ). The mobile station 16 invokes the channel estimation function 96 in response to the schedule provided by the base station 14 and in the codebook 250 ( Figure 15 shown in ) to determine which cluster best matches the channel response provided by the channel estimation function. The primary identifier corresponding to the selected cluster is then transmitted back to the base station...

example 2

[0132] According to a second example, the base station 14 may schedule the periodic transmission of the primary identifier as described above in example 1, while only transmitting the differential identifier back to the base station when the base station 14 requests it. refer to Figure 18 , is generally shown at 350 an exemplary transmission between a base station (BS) and first and second mobile stations (MS1 and MS2). Data transmission is shown as a plurality of alternating uplink (UL) frames 354 , 358 , 362 and downlink (DL) frames 352 , 356 , 360 . Each downlink or uplink frame 352-362 includes a number of subframes 364. An uplink frame is a transmission from the mobile station 16 to the base station 14, and a downlink frame is a transmission from the base station to the mobile station.

[0133] In the first subframe 366 of the uplink frame 354, both MS1 and MS2 are scheduled by the base station to feed back primary identifiers as indicated by arrows 368 and 370. Simil...

example 3

[0137] According to the third example, using the Figure 19 The codebook shown generally at 400 in implements aperiodic feedback of both primary and differential identifiers to the base station 14 . refer to Figure 19 , the codebook includes 2 N1 x 2 N2-1 channel response, in this case for N1 =4 and N2 =4 is CR1-CR128. Group the channel responses according to the correlation criteria into 2 N1 clusters 402-404 (ie for N1=4 for 16 clusters). Each cluster includes a header 406, a dummy codeword 408 and 2 N2-1 channel response members 410-412. Header 406 defines the primary identifier, while indices 0-7 define differential identifiers (codewords). A dummy codeword is used when the differential identifier identifying the channel response provided by the channel estimation function 96 no longer belongs to the cluster identified by the primary identifier.

[0138] refer to Figure 20 , a process for directing the mobile station 16 to determine a channel response cod...

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Abstract

A method and apparatus for feedback of channel information characterizing a wireless transmission between a base station and a mobile station over a communications channel. The method involves, at the base station, receiving a primary identifier identifying a cluster associated with a channel response generated by a mobile station, receiving a differential identifier identifying channel response member within the cluster identified by the primary identifier, and locating in a codebook of predetermined channel responses a predetermined channel response identified by the primary identifier and the differential identifier. The predetermined channel responses in the codebook are grouped in a plurality of clusters in accordance with a correlation criterion, each cluster including a plurality of predetermined channel response members. The method also involves generating a control signal for controlling transmissions to the mobile station in accordance with the located predetermined channel response. The method also involves, at the mobile station, determining a channel response for at least one carrier frequency received at the mobile station, and locating in a codebook of predetermined channel responses a predetermined channel response that is a closest match to the determined channel response, causing the mobile station to transmit a primary identifier identifying a cluster associated with the located predetermined channel response to the base station, and causing the mobile station to transmit a differential identifier identifying the located predetermined channel response member within the cluster identified by the primary identifier.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application 61 / 223,188, filed July 6, 2009, which is hereby incorporated by reference in its entirety. [0003] This application is an application of U.S. Provisional Patent Application 61 / 223,188, filed July 6, 2009 (which claims priority to U.S. Provisional Patent Application 61 / 078,491, filed July 7, 2008) pursuant to 37 C.F.R. § Continuation of nonprovisional application (serial number pending) transformed under 1.53(c)(3). technical field [0004] The present invention relates generally to wireless communications between base stations and mobile stations and more particularly to the feedback of channel information characterizing wireless transmissions between base stations and mobile stations. Background technique [0005] In wireless communication between a base station and a mobile station over a communication channel, system performance can be improved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/08H04W72/08
CPCH04L25/03936H04B7/0641H04B7/0639H04B7/0658
Inventor J.袁房慕娴H.尼科普尔代拉米
Owner APPLE INC
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