Handover signalling in wireless networks
First Claim
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1. A method comprising:
- a) receiving, by a serving base station from a wireless device on a primary cell in a plurality of cells, a first message comprising at least one parameter indicating whether said wireless device supports configuration of a plurality of timing advance groups (TAGs);
b) selectively transmitting at least one second message to said wireless device by said serving base station if said at least one parameter indicates support for configuration of said plurality of TAGs, said at least one second control message to cause in said wireless device;
i) configuration of at least one secondary cell in said plurality of cells; and
ii) assignment of each of said at least one secondary cell to a TAG in a first plurality of TAGs, said first plurality of TAGs comprising;
(1) a primary TAG comprising a first subset of said plurality of cells, said first subset comprising said primary cell, uplink transmissions by said wireless device in said primary TAG employing a first synchronization signal transmitted on said primary cell as a primary timing reference; and
(2) a secondary TAG comprising a second subset of said at least one secondary cell, uplink transmissions in said secondary TAG employing a second synchronization signal on an activated secondary cell in said secondary TAG as a secondary timing reference; and
c) transmitting, by said serving base station to at least one target base station, at least one third message in response to said serving base station making a handover decision, said at least one third message comprising at least one of;
i) said at least one parameter indicating whether said wireless device supports configuration of said plurality of TAGs; and
ii) configuration information of said first plurality TAGs.
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Abstract
A serving base station receives a first message comprising at least one parameter indicating whether a wireless device supports configuration of timing advance groups (TAGs). The serving base station transmits a second message causing assignment of each of at least one secondary cell to a TAG in a first plurality of TAGs. The serving base station transmits a third message to a target base station. The third message comprises at least one of: the at least one parameter indicating whether the wireless device supports configuration of the plurality of TAGs; and configuration information of the first plurality of TAGs.
109 Citations
20 Claims
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1. A method comprising:
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a) receiving, by a serving base station from a wireless device on a primary cell in a plurality of cells, a first message comprising at least one parameter indicating whether said wireless device supports configuration of a plurality of timing advance groups (TAGs); b) selectively transmitting at least one second message to said wireless device by said serving base station if said at least one parameter indicates support for configuration of said plurality of TAGs, said at least one second control message to cause in said wireless device; i) configuration of at least one secondary cell in said plurality of cells; and ii) assignment of each of said at least one secondary cell to a TAG in a first plurality of TAGs, said first plurality of TAGs comprising; (1) a primary TAG comprising a first subset of said plurality of cells, said first subset comprising said primary cell, uplink transmissions by said wireless device in said primary TAG employing a first synchronization signal transmitted on said primary cell as a primary timing reference; and (2) a secondary TAG comprising a second subset of said at least one secondary cell, uplink transmissions in said secondary TAG employing a second synchronization signal on an activated secondary cell in said secondary TAG as a secondary timing reference; and c) transmitting, by said serving base station to at least one target base station, at least one third message in response to said serving base station making a handover decision, said at least one third message comprising at least one of; i) said at least one parameter indicating whether said wireless device supports configuration of said plurality of TAGs; and ii) configuration information of said first plurality TAGs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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a) receiving, by a serving base station from a wireless device on a primary cell in a plurality of cells, a first message comprising at least one parameter indicating whether said wireless device supports configuration of a plurality of timing advance groups (TAGs); b) selectively transmitting at least one second message to said wireless device by said serving base station if said at least one parameter indicates support for configuration of said plurality of TAGs, said at least one second control message to cause in said wireless device; i) configuration of at least one secondary cell in said plurality of cells; and ii) assignment of each of said at least one secondary cell to a TAG in a first plurality of TAGs, said first plurality of TAGs comprising; (1) a primary TAG comprising a first subset of said plurality of cells, said first subset comprising said primary cell; and (2) a secondary TAG comprising a second subset of said at least one secondary cell; and c) transmitting, by said serving base station to at least one target base station, at least one third message in response to said serving base station making a handover decision, said at least one third message comprising at least one of; i) said at least one parameter indicating whether said wireless device supports configuration of said plurality of TAGs; and ii) configuration information of said first plurality TAGs. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A serving base station comprising:
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a) one or more communication interfaces; b) one or more processors; and c) memory storing instructions that, when executed, cause said serving base station to; i) receive a first message from a wireless device on a primary cell in a plurality of cells, said first message comprising at least one parameter indicating whether said wireless device supports configuration of a plurality of timing advance groups (TAGs); ii) selectively transmit at least one second message to said wireless device if said at least one parameter indicates support for configuration of said plurality of TAGs, said at least one second control message to cause in said wireless device; (1) configuration of at least one secondary cell in said plurality of cells; and (2) assignment of each of said at least one secondary cell to a TAG in a first plurality of TAGs, said first plurality of TAGs comprising; (a) a primary TAG comprising a first subset of said plurality of cells, said first subset comprising said primary cell; and (b) a secondary TAG comprising a second subset of said at least one secondary cell; and iii) transmit in response to said serving base station making a handover decision, at least one third message to at least one target base station, said at least one third message comprising at least one of; (1) said at least one parameter indicating whether said wireless device supports configuration of said plurality of TAGs; and (2) configuration information of said first plurality TAGs. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification