Efficient uplink measurement signal RX and TX window allocation with timing misalignment
First Claim
1. A method, performed by a serving node of a first User Equipment (UE) in a wireless communication network, of defining an uplink measurement signal reception window for a first candidate node comprising an access node in the network that is a candidate target for handing over the first UE, comprising:
- estimating a total timing misalignment between the first UE and the first candidate node;
defining the uplink measurement signal reception window comprising an integral number of symbol periods, not confined to predefined frame boundaries, comprising at least a predetermined minimum number of symbol periods and based on the estimated timing misalignment; and
transmitting information about the defined uplink measurement signal reception window to the first candidate node.
1 Assignment
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Accused Products
Abstract
A UE (22) in handover consideration transmits an uplink measurement signal comprising repetitions of a predetermined identity code. Network access nodes (18, 20) that are candidate handover target nodes receive the signal and use it for channel quality and timing offset measurements. To ensure that a predetermined minimum number of symbols are received without interference from user traffic, an uplink measurement signal reception window is defined for each candidate node (18, 20). The timing of the reception window is based on a total timing misalignment between the UE (22) and the candidate node. In some embodiments, the duration of the reception window is based on an uncertainty in the timing misalignment estimate. Reception of user data is precluded during the uplink measurement signal reception window (on the allocated subband, if the full uplink carrier is not used). The UE transmits the uplink measurement signal in an uplink measurement signal transmission window. In some embodiments, the duration of the transmission window is sufficient to encompass the uplink measurement signal reception windows of all candidate nodes.
23 Citations
34 Claims
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1. A method, performed by a serving node of a first User Equipment (UE) in a wireless communication network, of defining an uplink measurement signal reception window for a first candidate node comprising an access node in the network that is a candidate target for handing over the first UE, comprising:
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estimating a total timing misalignment between the first UE and the first candidate node; defining the uplink measurement signal reception window comprising an integral number of symbol periods, not confined to predefined frame boundaries, comprising at least a predetermined minimum number of symbol periods and based on the estimated timing misalignment; and transmitting information about the defined uplink measurement signal reception window to the first candidate node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A serving node comprising an access node in a wireless communication network providing service to a first User Equipment (UE) in the network, the network also including a plurality of candidate nodes comprising access node s in the network, other than the serving node, that are candidate targets for handing over the first UE, comprising:
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one or more antennas; a transceiver operatively connected to the antennas; and processing circuits operatively connected to the transceiver and operative to estimate a total timing misalignment between the first UE and a first candidate node; define an uplink measurement signal reception window comprising an integral number of symbol periods, not confined to predefined frame boundaries, comprising at least a predetermined minimum number of symbol periods and based on the estimated timing misalignment; and transmit information about the defined uplink measurement signal reception window to the first candidate node. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification