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Method of configuring cross-carrier CFI

A cross-carrier and carrier-carrier technology, applied in network planning, network traffic/resource management, digital transmission systems, etc., can solve problems such as scheduling constraints, impracticality, and inefficient CFI values, achieving low cost and improving bandwidth usage rate and improve the effect of inter-cell interference coordination

Inactive Publication Date: 2015-05-13
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] 1. For the MBSFN subframe carrying PMCH, it is not practical for all carriers to transmit PMCH at the same time;
[0018] 2. A common MBSFN subframe configuration for all carriers means that no legacy UEs can be scheduled on any carrier at a particular time, which creates severe scheduling constraints; and
[0023] a. The subframe type changes dynamically in time; therefore, if figure 2 Using a fixed CFI value for a long time is inefficient as shown in

Method used

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  • Method of configuring cross-carrier CFI

Examples

Experimental program
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Effect test

example 1

[0067] Since there are 3 possible CFI values, 2 bits are required for the CFI value. There are two subframe groups, referred to as subframe group A and subframe group B. The RRC signaling for the CFI value of each subframe group of a frame is 2+1+6=9 bits, that is, 2 bits are used for the CFI value of subframe group A (CFI=1, 2, 3), 1 bit for the CFI value of subframe group B (CFI = 1, 2), and 6 bits to indicate which of these 6 subframes belongs to subframe group B, corresponding to subframes that may potentially be MBSFN subframes .

[0068] If the MBSFN subframe configuration of the interfering cell is configured for 4 consecutive frames, 6 bits indicating the subframes belonging to subframe group B are not enough. In this case, the number of bits may be 2+1+24=27 bits.

example 2

[0070] If it is desired to reduce signaling overhead, the CFI values ​​can be limited as follows: CFI=3 and CFI=2 for subframe group A and subframe group B, respectively, since they are considered typical values ​​(for a 1.4MHz carrier, CFI=3 and CFI=1 are used for subframe group A and subframe group B respectively). In this case, only 6 bits (or 24 bits) are needed to indicate which subframes belong to subframe group B.

[0071] Note 1: MBSFN subframe configuration is actually optional. Therefore, a semi-static configuration with a CFI of 1, 2 or 3 is sufficient for the entire time period between two RRC (re)configurations if there are no MBSFN subframes configured by any eNB. In this case, all subframes may be set as subframe A in Example 1. In Example 2, the design can be modified to have 2+6 (or 24) = 8 (28) bits, i.e., 2 bits for the CFI value of subframe group A, so that all three CFI values ​​can be indicated . Note that 6 (or 24) bits may be used to indicate all su...

example 3

[0073] The RRC signaling bit width may be flexible according to conditions. If only one CFI value is sufficient (eg, when there are no MBSFN subframes configured within the macro cell), the RRC signaling can be 2 bits (CFI = 1, 2, 3). Otherwise, the RRC signaling can be the value given in Example 1 or Example 2.

[0074] Note 2: RRC signaling does not need to be frequently provided to the UE. This is because the MBSFN subframe configuration or the conditions experienced by the UE within the cell (which may trigger the need for RRC reconfiguration) do not change frequently.

[0075] We provide a high-level description of possible system operations. refer to Figure 4 , the following system operation including the following [Step 1] to [Step 7] is envisioned.

[0076][Step 1]: Heterogeneous deployment settings

[0077] Macro eNB:

[0078] 1. Macro eNB has aggregated two carriers (carrier #0 and carrier #1).

[0079] • Carrier #0 transmits with reduced power (small coverag...

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Abstract

A method of configuring the cross-carrier CFI such that separate CFI value can be specified for each subframe within an x number of consecutive frames. The same set of CFI values is applied by the UE for every other x consecutive frames until it is reconfigured by the eNB.

Description

[0001] priority statement [0002] This application claims priority from Japanese Patent Application No. 2010-87494 filed Apr. 6, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to a mobile system. Background technique [0004] A major feature introduced in Long Term Evolution (LTE) Release 10 (LTE-Advanced) is carrier aggregation, where more than two component carriers (CCs) are aggregated in order to support wider transmission bandwidths, e.g., up to 100 MHz, and for Spectrum aggregation (see reference 7 below). Once a user equipment (UE) is configured with carrier aggregation, the UE can simultaneously receive or transmit on all CCs that are aggregated. Therefore, a UE can be scheduled on multiple CCs simultaneously. More detailed information is available in Section 5 of Reference 7. [0005] Carrier aggregation has been recognized as a useful tool for managing / coordinating inter-cell interference for he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/12H04W84/10H04W92/10
CPCH04L5/0091H04W48/08H04W72/00H04W16/32H04W28/04H04W88/06H04W72/0446H04W72/1215H04L5/001
Inventor 吴文龙
Owner LENOVO INNOVATIONS LTD HONG KONG