Cell ID allocation in a heterogeneous network

1. A wireless communication system in a heterogeneous network, the wireless communication system comprising:

a macro cell that comprises a base station and at least one low power node communicatively coupled to the base station; and

a cell identifier (ID) allocator configured to:

identify a series of numeric values as multiple candidate cell IDs;

allocate a first cell ID, from the multiple candidate cell IDs, for the macro cell;

determine a mathematical trait, for each of the multiple candidate cell IDs, by calculation of a remainder of a division of the respective candidate cell ID by a particular number;

allocate a second cell ID for the at least one low power node based on the determined mathematical trait, wherein the second cell ID is mathematically distinct from the first cell ID; and

configure the at least one low power node and the macro cell to respectively use the allocated first and second cell IDs to operate the wireless communication system.

2. The wireless communication system of claim 1 , wherein the cell ID allocator is further configured to:

identify, from the multiple candidate cell IDs, a subset of candidate cell IDs associated with the first cell ID, wherein the second cell ID allocated to the at least one low power node is mathematically distinct from the subset of candidate cell IDs.

3. The wireless communication system of claim 2 , wherein the cell ID allocator is configured to identify the subset of candidate cell IDs by identification of candidate cell IDs that have a same remainder of the division by the particular number as the first cell ID.

4. The wireless communication system of claim 1 , further comprising a resource manager configured to allocate one or more frequency blocks for the macro cell and the at least one low power node, for transmission of a common reference signal (CRS), in accordance with the first cell ID and the second cell ID.

5. The wireless communication system of claim 1 , wherein the cell ID allocator is configured to identify the multiple candidate cell IDs in accordance with a wireless communication protocol.

6. The wireless communication system of claim 5 , wherein the wireless communication protocol includes a long term evolution (LTE) protocol.

7. The wireless communication system of claim 1 , wherein the cell ID allocator is further configured to divide the multiple candidate cell IDs into a number of groups equal to the particular number.

8. The wireless communication system of claim 1 , wherein the calculated remainder of the division for the second cell ID is different than the calculated remainder of the division for the first cell ID.

9. The wireless communication system of claim 1 , wherein the base station is configured to provide wireless communication for a first set of mobile devices, and wherein the at least one low power node is configured to serve as a proxy for the wireless communication system between a second set of mobile devices and the base station.

10. The wireless communication system of claim 9 , wherein the base station is further configured to transmit one or more common reference signals to the first set of mobile devices, and wherein the at least one low power node is further configured to transmit the one or more common reference signals to the second set of mobile devices.

11. The wireless communication system of claim 1 , wherein the at least one low power node is located within a coverage of the macro cell.

12. A method performed by a base station in a wireless communication system, the method comprising:

identifying a series of numeric values as multiple candidate cell IDs;

allocating a first cell ID, from the multiple candidate cell IDs, for a macro cell;

determining a mathematical trait, for each of the multiple candidate cell IDs, by calculating a remainder of a division of the respective candidate cell ID by a particular number;

allocating a second cell ID for at least one low power node based on the determined mathematical trait, wherein the second cell ID is mathematically distinct from the first cell ID; and

configuring the macro cell and the at least one low power node to respectively use the allocated first and second cell IDs to operate the wireless communication system.

13. The method of claim 12 , further comprising allocating at least one frequency block for each of the macro cell and the at least one low power node, for transmission of a common reference signal (CRS), in accordance with the first cell ID and the second cell ID.

14. The method of claim 13 , wherein the allocating the at least one frequency block, for each of the macro cell and the at least one low power node, comprises allocating at least a first frequency block for the macro cell and at least a second frequency block for the at least one low power node, wherein the first frequency block is different than the second frequency block.

15. The method of claim 14 , further comprising transmitting the CRS in the allocated first frequency block to a set of user equipment in a range of the macro cell.

16. The method of claim 12 , further comprising identifying, from the multiple candidate cell IDS, a subset of candidate cell IDs associated with the first cell ID, wherein the second cell ID allocated to the at least one low power node is mathematically distinct from the subset of candidate cell IDs.

17. The method of claim 12 , wherein the allocating the second cell ID for the at least one low power node comprises allocating a cell ID for which the calculated remainder of the division is different than the calculated remainder of the division for the first cell ID.

18. The method of claim 12 , further comprising dividing the multiple candidate cell IDs into a number of groups that is equal to the particular number.

19. The method of claim 12 , wherein the identifying the multiple candidate cell IDs comprises identifying the multiple candidate cell IDs in accordance with a wireless communication protocol.

20. The method of claim 19 , wherein the wireless communication protocol includes a long term evolution (LTE) protocol.

21. A base station in a wireless communication system, the base station comprising:

a cell identifier (ID) allocator configured to:

identify a series of numeric values as multiple candidate cell IDs;

allocate a first cell ID, from the multiple candidate cell IDs, for a macro cell;

determine a mathematical trait, for each of the multiple candidate cell IDs, by calculation of a remainder of a division of the respective candidate cell ID by a particular number;

allocate a second cell ID for at least one low power node based on the determined mathematical trait, wherein the second cell ID is mathematically distinct from the first cell ID; and

configure the macro cell and the at least one low power node to respectively use the allocated first and second cell IDs to operate the wireless communication system; and

a common reference signal (CRS) resource allocator configured to:

allocate one or more frequency bands to the macro cell and the at least one power node based on the first cell ID and the second cell ID respectively.

22. The base station of claim 21 , further comprising an antenna configured to transmit the CRS in the one or more frequency bands allocated to the macro cell.

23. The base station of claim 21 , wherein the cell ID allocator is further configured to:

identify, from the multiple candidate cell IDS, a subset of candidate cell IDs associated with the first cell ID, wherein the second cell ID allocated for the at least one low power node is mathematically distinct from the subset of candidate cell IDs.

24. The base station of claim 21 , wherein the calculated remainder of the division for the second cell ID is different than the calculated remainder of the division for the first cell ID.

25. The base station of claim 21 , wherein the CRS resource allocator is configured to allocate a same frequency band, for transmission of the CRS, to a plurality of cells assigned with cell IDs that have a same remainder of the division by the particular number.