Method for assigning a unique word in a communication system
First Claim
1. A method for assigning a unique word to a personal station in an SDMA (Spatial Division Multiple Access) communication system, the SDMA communication system having a set of available unique words comprising:
- receiving a request message at a cell station having a directable antenna, the request message being sent from the personal station;
extracting information from the request message that is indicative of a first unique word;
determining if the personal station is being handed off from another cell;
comparing, if the personal station is being handed off, the first unique word to the set of unique words, the unique words in the set of unique words are each for use by the cell station in directing the antenna, the comparing including determining a level of cross correlation between the first unique word and each of the unique words in the set of available unique words; and
adjusting priority of the unique words based on the comparison of the first unique word to the set of unique words, the adjusting priority including setting unique words with lower cross correlation effects to a higher priority.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system for assigning unique words in an SDMA (spatial division multiple access) communication system is disclosed. A base station has a set of available unique words from which to select and assign unique words. The base station prioritizes the set of unique words by determining which unique words are likely to interfere with adjacent base stations, and setting those words to a low priority. In this way, over time, the base station assigns unique words that have a lower level of correlation to allow for better signal differentiation and improved communication sensitivity. When a mobile device enters a base station'"'"'s geographic area, it generates an establish request message that indicates what unique word it is using in the adjacent cell. The base station extracts this unique word, and sets it to a low priority in its set of unique words. The base station is therefore able to assign unique words that facilitate improved communications.
6 Citations
22 Claims
-
1. A method for assigning a unique word to a personal station in an SDMA (Spatial Division Multiple Access) communication system, the SDMA communication system having a set of available unique words comprising:
-
receiving a request message at a cell station having a directable antenna, the request message being sent from the personal station; extracting information from the request message that is indicative of a first unique word; determining if the personal station is being handed off from another cell; comparing, if the personal station is being handed off, the first unique word to the set of unique words, the unique words in the set of unique words are each for use by the cell station in directing the antenna, the comparing including determining a level of cross correlation between the first unique word and each of the unique words in the set of available unique words; and adjusting priority of the unique words based on the comparison of the first unique word to the set of unique words, the adjusting priority including setting unique words with lower cross correlation effects to a higher priority. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for assigning unique words from a cell station to a set of personal stations, comprising:
-
storing a set of unique words for the cell station where the unique words are each for use by the cell station in directing an antenna, the set of unique words including about 10 unique words and a number of unique words that are permitted to be assigned is about 3; receiving an establish request from an arriving personal station, the arriving personal station also communicating with another cell station; extracting information from the establish request to determine an adjacent unique word used by an arriving personal station; prioritizing the set of unique words according to correlation with the adjacent unique word; and assigning unique words from the set of unique words so that higher priority words are assigned before lower priority unique words are assigned. - View Dependent Claims (14, 15, 16, 17, 18)
-
-
19. A method for prioritizing the assignment of unique words from a base station, comprising:
-
storing a set of unique words that are useful in implementing an SDMA (Spatial Division Multiple Access) communication process, the unique words each being for use by the base station in directing an antenna, a subset of the set of unique words including a set of assignable unique words; receiving a request message that is indicative of a first unique word; determining that the first unique word is in use at an adjacent base station; comparing the first unique word to at least some of the unique words in the set of available unique words; and adjusting priority of the unique words in the set of unique words according to the comparison, the adjusting including replacing one of the unique words in the set of assignable unique words, and placing the replaced unique word at a lower priority in the set of unique words. - View Dependent Claims (20, 21, 22)
-
Specification