Method of maintaining multiple timing advance
First Claim
1. A method for managing and maintaining timing advance in a multi-carrier wireless communication network, the method comprising:
- assigning a primary cell (PCELL) of a user equipment (UE) to a first timing advance (TA) group, wherein the first TA group is associated with a first TA group index and a first uplink timing advance;
assigning a secondary cell (SCELL) of the UE to a second TA group, wherein the second TA group is associated with a second TA group index and a second uplink timing advance;
receiving a timing reference signal from the UE over the SCELL;
transmitting the second uplink timing advance to be applied for the second TA group based on timing measurements of the timing reference signal; and
providing the first TA group with a first TA timer value and providing the second TA group with a second TA timer value, wherein the first TA timer value and the second TA timer value are configured based on a cell coverage size of the PCELL and the SCELL respectively, and wherein the second TA timer has a larger value than the first TA timer if the SCELL has a smaller cell coverage size than the PCELL.
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Accused Products
Abstract
A method of managing multiple timing advance (TA) groups, maintaining multiple TA timers, and performing UL synchronization in a multi-carrier wireless system is provided. When a new component carrier (CC) is configured, it is assigned to a TA group having a TA group identifier. The TA groups are managed statically or dynamically. The TA group identifier is used to uniquely identify the TA group in the operations of uplink (UL) timing synchronization. Multiple TA timers are assigned to multiple TA groups. The TA timers may have different values for different TA group. Different embodiments of UL timing adjustments for multiple TA groups are provided.
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Citations
16 Claims
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1. A method for managing and maintaining timing advance in a multi-carrier wireless communication network, the method comprising:
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assigning a primary cell (PCELL) of a user equipment (UE) to a first timing advance (TA) group, wherein the first TA group is associated with a first TA group index and a first uplink timing advance; assigning a secondary cell (SCELL) of the UE to a second TA group, wherein the second TA group is associated with a second TA group index and a second uplink timing advance; receiving a timing reference signal from the UE over the SCELL; transmitting the second uplink timing advance to be applied for the second TA group based on timing measurements of the timing reference signal; and providing the first TA group with a first TA timer value and providing the second TA group with a second TA timer value, wherein the first TA timer value and the second TA timer value are configured based on a cell coverage size of the PCELL and the SCELL respectively, and wherein the second TA timer has a larger value than the first TA timer if the SCELL has a smaller cell coverage size than the PCELL. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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configuring a primary cell (PCELL) that belongs to a first timing advance (TA) group having a first TA group index and a first uplink timing advance; configuring a secondary cell (SCELL) that belongs to a second TA group having a second TA group index and a second uplink timing advance; transmitting a timing reference signal over the SCELL to a base station; receiving a response message from the base station, wherein the response message carries the second uplink timing advance and thereby applying timing adjustment for uplink transmission over the SCELL; and receiving a first TA timer value associated with the first TA group and a second TA timer value associated with the second TA group, wherein the first TA timer value and the second TA timer value are based on a cell coverage size of the PCELL and the SCELL respectively, and wherein the second TA timer has a larger value than the first TA timer if the SCELL has a smaller cell coverage size than the PCELL. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification