Wireless/wired backhaul-aware cell selection mechanism
A method for selecting a cell in a wireless communication system includes performing a cell selection process in a mobile terminal, which includes receiving, in the mobile terminal, information from each of at least one cell, each information including a preference value, where each preference value indicates a congestion level of a corresponding one of the at least one cell, and selecting, in the mobile terminal, one of the at least one cell according to the received preference value. The method for selecting a cell a wireless communication system further includes attempting, by the mobile terminal, to connect with the selected cell by performing a random access procedure with the selected cell.
1. A method for selecting a cell in a wireless communication system, the method comprising:
performing a cell selection process in a mobile terminal comprising:
receiving, in the mobile terminal, information from each of at least one cell, each information comprising a preference value, wherein each preference value indicates a congestion level of a corresponding one of the at least one cell, and
selecting, in the mobile terminal, one of the at least one cell according to the received preference value; and
attempting, by the mobile terminal, to connect with the selected cell by performing a random access procedure with the selected cell,
wherein performing the random access procedure with the selected cell comprises:
transmitting a random access request to connect with the selected cell;
receiving a random access response from the selected cell;
performing a scheduled transmission to the selected cell upon receiving the random access response; and
receiving, in the mobile terminal, decision information from the selected cell indicating whether the mobile terminal is to connect with the selected cell,
wherein the decision information indicates rejection of a connection between the mobile terminal and the selected cell, and
wherein the selected cell transmits a cell radio network temporary identifier (C-RNTI) to candidate cells when the decision information indicates rejection of the connection between the mobile terminal and the selected cell.
2. The method of claim 1 , wherein the mobile terminal attempts to connect with the selected cell via a relay node.
3. The method of claim 1 , wherein the selected cell includes a relay node.
4. The method of claim 1 , wherein the preference value is set according to a congestion level of each traffic class of a corresponding one of the at least one cell.
5. The method of claim 4 , wherein one of the at least one cell is selected according to a traffic class of the mobile terminal.
6. The method of claim 1 , wherein the information is a system information block.
7. The method of claim 1 , wherein the scheduled transmission comprises at least one of:
a traffic class;
a list of candidate cells; and
a link quality.
8. The method of claim 1 , further comprising attempting, by the mobile terminal, to connect with one of the candidate cells by performing a random access procedure with one of the candidate cells.
9. The method of claim 1 , wherein the mobile terminal performs a non-contention based random access procedure with one of the candidate cells by using the C-RNTI, wherein the C-RNTI is included in the received random access response.
10. The method of claim 1 , wherein the random access procedure is a contention-based random access procedure.