Method and apparatus for initial ranging in wireless communication system including heterogeneous network
View Patent ↗An apparatus and method for initial ranging in a wireless communication system including a heterogeneous network. An operation of a terminal includes selecting a serving cell considering a biased value of a base station applying range expansion. The operation also includes receiving ranging code classification information and threshold information associated with the serving cell. The operation further includes, if a channel quality with the serving cell is less than the threshold, selecting one a plurality of poor-expected-ranging codes indicated by the ranging code classification information, and performing initial ranging using the selected poor-expected-ranging code.
1. A method for an operation of a terminal in a wireless communication system, the method comprising:
selecting a serving cell in consideration of a biased value for a base station (BS) applying range expansion;
receiving ranging code classification information and channel quality threshold information associated with the serving cell;
if a channel quality with the serving cell is less than a channel quality threshold of the channel quality threshold information, selecting one of a plurality of poor-expected-ranging codes indicated by the ranging code classification information; and
performing initial ranging using the selected poor-expected-ranging code.
2. The method of claim 1 , wherein the ranging code classification information comprises allocation information on the poor-expected-ranging codes.
3. The method of claim 2 , wherein the allocation information on the poor-expected-ranging codes comprises group classification information indicating a result of classifying the poor-expected-ranging codes into a plurality of groups,
each of the plurality of groups indicating each of a plurality of adjacent BSs of the serving cell.
4. The method of claim 3 , wherein selecting one of the poor-expected-ranging codes comprises selecting a poor-expected-ranging code belonging to a group indicating an adjacent BS corresponding to reception signal strength higher than that of the serving cell.
5. The method of claim 1 , further comprising receiving information regarding an interference-coordinated resource from the serving cell.
6. The method of claim 5 , wherein the information regarding the interference-coordinated resource comprises at least one of: a time point at which an interference-coordinated subframe or subchannel is transmitted, a period, and an index.
7. The method of claim 5 , wherein the information regarding the interference-coordinated resource comprises information regarding an interference-coordinated resource to be allocated to the terminal.
8. The method of claim 5 , wherein the information regarding the interference-coordinated resource is information considering interference coordination with a different BS indicated by the poor-expected-ranging code.
9. The method of claim 5 , further comprising, if the information is not an interference-coordinated resource duration, discontinuing signal reception and decoding operation.
10. The method of claim 1 , wherein the serving cell has coverage overlaid with a macro cell.
11. A method for an operation of a base station (BS) in a wireless communication system, the method comprising:
transmitting ranging code classification information and channel quality threshold information;
receiving one of a plurality of poor-expected-ranging codes indicated by the ranging code classification information; and
recognizing that a terminal having transmitted the poor-expected-ranging code has a channel quality less than or equal to a channel quality threshold of the channel quality threshold information.
12. The method of claim 11 , wherein the ranging code classification information comprises allocation information on the poor-expected-ranging codes.
13. The method of claim 12 , wherein the allocation information on the poor-expected-ranging codes comprises group classification information indicating a result of classifying the poor-expected-ranging codes into a plurality of groups,
each of the plurality of groups indicating each of a plurality of adjacent BSs of the serving cell.
14. The method of claim 11 , further comprising transmitting information regarding an interference-coordinated resource to the terminal.
15. The method of claim 14 , wherein the information regarding the interference-coordinated resource comprises at least one of: a time point at which an interference-coordinated subframe or subchannel is transmitted, a period, and an index.
16. The method of claim 14 , wherein the information regarding the interference-coordinated resource comprises information regarding an interference-coordinated resource to be allocated to the terminal.
17. The method of claim 14 , wherein the information regarding the interference-coordinated resource is information considering interference coordination with a different BS indicated by the poor-expected-ranging code.
18. The method of claim 14 , further comprising performing communication with the terminal within the limits of the interference-coordinated resource.
19. A terminal apparatus in a wireless communication system, the apparatus comprising:
a controller configured to select a serving cell in consideration of a biased value for a base station (BS) applying range expansion; and
a modulator/demodulator (modem) configured to receive ranging code classification information and channel quality threshold information associated with the serving cell,
wherein, if a channel quality with the serving cell is less than a channel quality threshold of the channel quality threshold information, the controller is configured to control to select one of a plurality of poor-expected-ranging codes indicated by the ranging code classification information, and perform initial ranging using the selected poor-expected-ranging code.
20. The apparatus of claim 19 , wherein the ranging code classification information comprises allocation information on the poor-expected-ranging codes.
21. The apparatus of claim 20 , wherein the allocation information on the poor-expected-ranging codes comprises group classification information indicating a result of classifying the poor-expected-ranging codes into a plurality of groups,
each of the plurality of groups indicating each of a plurality of adjacent BSs of the serving cell.
22. The apparatus of claim 21 , wherein the controller is configured to select a poor-expected-ranging code belonging to a group indicating an adjacent BS corresponding to reception signal strength higher than that of the serving cell.
23. The apparatus of claim 19 , wherein the modem is configured to receive information regarding an interference-coordinated resource from the serving cell.
24. The apparatus of claim 23 , wherein the information regarding the interference-coordinated resource comprises at least one of: a time point at which an interference-coordinated subframe or subchannel is transmitted, a period, and an index.
25. The apparatus of claim 23 , wherein the information regarding the interference-coordinated resource comprises information regarding an interference-coordinated resource to be allocated to the terminal.
26. The apparatus of claim 23 , wherein the information regarding the interference-coordinated resource is information considering interference coordination with a different BS indicated by the poor-expected-ranging code.
27. The apparatus of claim 23 , wherein, if the information is not an interference-coordinated resource duration, the controller is configured to discontinue signal reception and decoding operation.
28. The apparatus of claim 19 , wherein the serving cell has coverage overlaid with a macro cell.
29. A base station (BS) apparatus in a wireless communication system, the apparatus comprising;
a modulator/demodulator (modem) configured to transmit ranging code classification information and channel quality threshold information; and
a controller configured to, if one of a plurality of poor-expected-ranging codes indicated by the ranging code classification information is received, recognize that a terminal having transmitted the poor-expected-ranging code has a channel quality less than or equal to a channel quality threshold of the channel quality threshold information.
30. The apparatus of claim 29 , wherein the ranging code classification information comprises allocation information on the poor-expected-ranging codes.
31. The apparatus of claim 30 , wherein the allocation information on the poor-expected-ranging codes comprises group classification information indicating a result of classifying the poor-expected-ranging codes into a plurality of groups,
each of the plurality of groups indicating each of a plurality of adjacent BSs of the serving cell.
32. The apparatus of claim 29 , wherein the modem transmits information regarding an interference-coordinated resource to the terminal.
33. The apparatus of claim 32 , wherein the information regarding the interference-coordinated resource comprises at least one: of a time point at which an interference-coordinated subframe or subchannel is transmitted, a period, and an index.
34. The apparatus of claim 32 , wherein the information regarding the interference-coordinated resource comprises information regarding an interference-coordinated resource to be allocated to the terminal.
35. The apparatus of claim 32 , wherein the information regarding the interference-coordinated resource is information considering interference coordination with a different BS indicated by the poor-expected-ranging code.
36. The apparatus of claim 32 , wherein the controller is configured to perform communication with the terminal within the limits of the interference-coordinated resource.