Method of allocating walsh codes and quasi-orthogonal functional codes in a CDMA network

摘要

A method of allocating Walsh codes and Quasi-orthogonal Functional, QoF, codes in a CDMA system in which a finite number of Walsh codes are defined, and some mobile terminals operating in the CDMA system are capable of supporting Advanced Quasi-Linear Interference Cancellation, AQLIC, and some mobile terminals operating in the CDMA system are non-AQLIC-capable. Walsh codes are allocated to control channels. A code allocation unit then determines a threshold number of Walsh codes to reserve for non-AQLIC-capable mobile terminals. When a current Walsh code usage level is less than the threshold, the unit allocates Walsh codes to both the AQLIC-capable mobile terminals and the non-AQLIC-capable mobile terminals. When the current Walsh code usage level is greater than the threshold, the unit allocates QoF codes only to AQLIC-capable mobile terminals, and allocates Walsh codes to non-AQLIC-capable mobile terminals.

主权项

1. A method of allocating Walsh codes and Quasi-orthogonal Functional, QoF, codes to mobile terminals in a Code Division Multiple Access, CDMA, system in which a finite number of Walsh codes are defined, and some mobile terminals operating in the CDMA system are capable of supporting Advance Quasi-Linear Interference Cancellation, AQLIC, and some mobile terminals operating in the CDMA system are non-AQLIC-capable, the method comprising the steps of:
determining a user loading per carrier-sector; determining whether the finite number of Walsh codes is sufficient to support the user loading; when the finite number of Walsh codes is sufficient to support the user loading, allocating Walsh codes to both the AQLIC-capable mobile terminals and the non-AQLIC-capable mobile terminals; and when the finite number of Walsh codes is not sufficient to support he user loading:
allocating QoF codes only to AQLIC-capable mobile terminals; andallocating Walsh codes to non-AQLIC-capable mobile terminals.