Techniques for supporting relay operation in wireless communication systems
First Claim
1. A method for wireless communication, comprising:
- generating a bitmap covering a plurality of radio frames, each radio frame comprising a plurality of subframes, wherein at least one bit in the bitmap identifies a specific type of at least two subframe types for one of the plurality of subframes, and wherein at least one bit in the bitmap indicates to receiving user equipments (UEs) whether to perform a channel characteristic inquiry using the respective subframe based on the subframe type identified by the respective bit; and
transmitting the bitmap to the UEs, wherein the bitmap includes at least one bit for indicating said type of at least one of said subframes of at least two types, and wherein the subframes of at least two types comprise multicast/broadcast single frequency network (MBSFN)/blank subframes and regular subframes;
wherein the channel characteristic inquiry includes a channel estimation based on a reference signal that is performed only for the regular subframes and is skipped for the MBSFN/blank subframes.
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Abstract
Techniques for supporting operation of relay stations in wireless communication systems are described. In an aspect, a bitmap may be sent by a base station and/or a relay station to identify subframes of at least two types in multiple radio frames. For example, the bitmap may indicate whether each subframe covered by the bitmap is of a first type or a second type. UEs may use the bitmap to control their operation. For example, a UE may perform channel estimation or measurement for the subframes of the first type and may skip channel estimation and measurement for the subframes of the second type. In another aspect, a base station may transmit data and/or control information on resources not used by a relay station to transmit a reference signal. This may avoid interference to the reference signal from the relay station, which may improve performance for UEs communicating with the relay station.
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Citations
21 Claims
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1. A method for wireless communication, comprising:
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generating a bitmap covering a plurality of radio frames, each radio frame comprising a plurality of subframes, wherein at least one bit in the bitmap identifies a specific type of at least two subframe types for one of the plurality of subframes, and wherein at least one bit in the bitmap indicates to receiving user equipments (UEs) whether to perform a channel characteristic inquiry using the respective subframe based on the subframe type identified by the respective bit; and transmitting the bitmap to the UEs, wherein the bitmap includes at least one bit for indicating said type of at least one of said subframes of at least two types, and wherein the subframes of at least two types comprise multicast/broadcast single frequency network (MBSFN)/blank subframes and regular subframes; wherein the channel characteristic inquiry includes a channel estimation based on a reference signal that is performed only for the regular subframes and is skipped for the MBSFN/blank subframes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for wireless communication, comprising:
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means for generating a bitmap covering a plurality of radio frames, each radio frame comprising a plurality of subframes, wherein at least one bit in the bitmap identifies a specific type of at least two subframe types for one of the plurality of subframes, and wherein at least one bit in the bitmap indicates to receiving user equipments (UEs) whether to perform a channel characteristic inquiry using the respective subframe based on the subframe type identified by the respective bit; and means for transmitting the bitmap to the UEs, wherein the bitmap includes at least one bit for indicating said type of at least one of said subframes of at least two types, and wherein the subframes of at least two types comprise multicast/broadcast single frequency network (MBSFN)/blank subframes and regular subframes; wherein the channel characteristic inquiry includes a channel estimation based on a reference signal that is performed only for the regular subframes and is skipped for the MBSFN/blank subframes. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus for wireless communication, comprising:
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at least one processor, and a memory coupled to the at least one processor comprising instructions which, when executed by the at least one processor, cause the apparatus to; generate a bitmap covering a plurality of radio frames, each radio frame comprising a plurality of subframes, wherein at least one bit in the bitmap identifies a specific type of at least two subframe types for one of the plurality of subframes, and wherein at least one bit in the bitmap indicates to receiving user equipments (UEs) whether to perform a channel characteristic inquiry using the respective subframe based on the subframe type identified by the respective bit; and send the bitmap to the UEs, wherein the bitmap includes at least one bit for indicating said type of at least one of said subframes of at least two types, and wherein the subframes of at least two types comprise multicast/broadcast single frequency network (MBSFN)/blank subframes and regular subframes; wherein the channel characteristic inquiry includes a channel estimation based on a reference signal that is performed only for the regular subframes and is skipped for the MBSFN/blank subframes. - View Dependent Claims (14, 15, 16, 17)
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18. A computer program product, comprising:
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a non-transitory computer-readable medium comprising; code for causing at least one computer to generate a bitmap covering a plurality of radio frames, each radio frame comprising a plurality of subframes, wherein at least one bit in the bitmap identifies a specific type of at least two subframe types for one of the plurality of subframes, and wherein at least one bit in the bitmap indicates to receiving user equipments (UEs) whether to perform a channel characteristic inquiry using the respective subframe based on the subframe type identified by the respective bit; and code for causing the at least one computer to send the bitmap to the UEs, wherein the bitmap includes at least one bit for indicating said one of at least one of said subframes of at least two types, and wherein the subframes of at least two types comprise multicast/broadcast single frequency network (MBSFN)/blank subframes and regular subframes; wherein the channel characteristic inquiry includes a channel estimation based on a reference signal that is performed only for the regular subframes and is skipped for the MBSFN/blank subframes. - View Dependent Claims (19, 20, 21)
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Specification