Timing Advance Group in LTE Small Cell Enhancement
A method for communication in a wireless telecommunication system is provided. The method includes assigning a first cell of a first network node to a first timing advance group (TAG) of a user equipment (UE) and assigning a second cell of a second network node to a second TAG of the UE, wherein the second network node has a separate MAC (medium access control) scheduler from the first network node, and wherein the UE is able to transmit data on both the first and the second cell.
1 . A method for communication in a wireless telecommunication system, the method comprising:
assigning a first cell of a first network node to a first timing advance group (TAG) of a user equipment (UE);
assigning a second cell of a second network node to a second TAG of the UE, wherein the second network node has a separate MAC (medium access control) scheduler from the first network node, and wherein the UE is able to transmit data on both the first and the second cell.
2 . The method of claim 1 , wherein the second TAG is different from the first TAG.
3 . The method of claim 1 , wherein the second TAG is the same as the first TAG.
4 . The method of claim 1 , wherein the assigning of at least one cell to a TAG is provided by the UE.
5 . The method of claim 1 , wherein the UE adjusts uplink transmission on the first cell and the second cell using the timing advance information of the first and the second TAG.
6 . The method of claim 1 , wherein the assigning of at least one cell to the first or second TAG is provided by the first network node.
7 . The method of claim 6 , wherein the first network node receives timing advance information from the second network node in determining the TAG assignment of the second cell.
8 . The method of claim 6 , wherein the first network node receives timing advance information from the UE in determining the TAG assignment of the first cell.
9 . The method of claim 1 , wherein the assigning of the first network node to the first TAG takes into account a time synchronization information of the first cell.
10 . The method of claim 8 , wherein the first network node stores information about the first cell and assigns the first cell to the first timing advance group based on the stored information.
11 . A user equipment (UE) comprising:
a processor configured such that the UE is able to transmit data on both a first and a second cell, where the first cell of a first network node is assigned to a first timing advance group (TAG) of the UE, and the second cell of a second network node is assigned to a second TAG of the UE, and wherein the second network node has a separate MAC (medium access control) scheduler from the first network node.
12 . The method of claim 11 , wherein the second TAG is different from the first TAG.
13 . The method of claim 11 , wherein the second TAG is the same as the first TAG.
14 . The UE of claim 11 , wherein the UE transmits information about the first timing advance group to the first network node.
15 . The method of claim 11 , wherein the UE adjusts uplink transmission on the first cell and the second cell using the timing advance information of the first and second TAG.
16 . A first network node comprising:
a processor configured such that the first network node assigns a first cell of the first network node to a first timing advance group (TAG) of a user equipment (UE), the first network node assigns a second cell of a second network node to a second TAG of the UE, wherein the second network node has a separate MAC (medium access control) scheduler from the first network node.
17 . The first network node of claim 16 , wherein the first network node transmits to the UE the assignment of the first cell to the first TAG.
18 . The first network node of claim 16 , wherein the first network node transmits to the UE the assignment of the second cell to the second TAG.
19 . The first network node of claim 16 , wherein the first network node transmits timing information regarding the first timing advance group to the user equipment (UE).
20 . The first network node of claim 16 , wherein the first network node receives timing information regarding the second cell from the second network node.
21 . The first network node of claim 16 , wherein the first network node takes into account a time synchronization information of the second cell in assigning the second cell to the second TAG of the UE.
22 . The first network node of claim 16 , wherein the first network node stores information about the first cell and assigns the first cell to the first timing advance group based on the stored information.