Method and base station for allocating pseudo noise code
AssigneeNEC Corporation
InventorsHiroshi Furukawa, Kojiro Hamabe, Akihisa Ushirokawa
Life of this patent
Estimating the term…
Abstract
To prevent degradation of transmission quality due to interference between scramble codes, under such a situation as soft hand over, when the number of mobile stations connected with a base station exceeds the number of the orthogonal codes. The base station decides the priority of the scramble code. The scramble code is allocated to the mobile station, in accordance with the priority. When a mobile station ends its call, or stops temporarily its call, its PN code is re-allocated to the mobile station with lowest priority code.
Claims41
A code allocation method for allocating a first set of first codes and a second set of second codes to mobile stations, the method comprising:
- generating a third set of combined codes by multiplying said first codes by one of said second codes;
- allocating each of said combined codes to each of said mobile stations;
- transmitting spread spectrum signals with said combined codes to said mobile stations;
- generating another set of combined codes by multiplying said first codes by another different code selected from said second set of said second codes after said third set of combined codes has been used to transmit an approved spectrum signals.
A code allocation method for allocating a first set of orthogonal codes and a second set of scramble codes to mobile stations, which comprises the steps of:
- generating a third set of combined codes by multiplying said orthogonal codes by one of said scramble codes;
- arranging said combined codes in a priority order;
- allocating each of said combined codes to each of said mobile stations;
- transmitting spread spectrum signals with said combined codes to said mobile stations.
A code allocation method for allocating a first set of first codes and a second set of second codes to mobile stations, which comprises the steps of:
- generating “M” sets of combined codes by multiplying said first codes by “M” said second codes, wherein M is defined by (int (N/S)+1), where N is the total number of code used by all the mobile stations connected with a base station and S is the total number of said orthogonal codes;
- transmitting spread spectrum signals with said combined codes to said mobile stations.
A base station for allocating a first set of first codes and a second set of second codes to “k” mobile stations, which comprises:
- “k” spread adder units for inputting said second codes and transmission signals accompanied by said second codes for outputting spread spectrum signals;
- and
- an adder for adding said spread spectrum signals from said “k” spread adders units, wherein:
- a third set of combined codes is generated by multiplying said first codes by one of said second codes;
- each of said combined codes is allocated to each of said “k” mobile stations;
- said spread spectrum signals with said combined codes are transmitted from said adder to said “k” mobile stations;
- and
- another set of combined codes is generated by multiplying said first codes by an other code selected from said second codes, for meeting ta shortage of said combined codes included in said third set.
A base station for allocating a first set of first codes and a second set of second codes to “k” mobile stations, which comprises:
- “k” spread adder units for inputting said second codes and transmission signals accompanied by said second codes for outputting spread spectrum signals;
- and
- an adder for adding said spread spectrum signals from said “k” spread adders units, wherein:
- a third set of combined codes is generated by multiplying said first codes by one of said second codes;
- said combined codes are arranged in a priority order;
- each of said combined codes is allocated to each of said mobile stations;
- and
- said spread spectrum signals with said combined codes are transmitted from said adder to said “k” mobile stations.
A base station for allocating a first set of first codes and a second set of second codes to “k” mobile stations, which comprises:
- “k” spread adder units for inputting said second codes and transmission signals accompanied by said second codes for outputting spread spectrum signals;
- and
- an adder for adding said spread spectrum signals from said “k” spread adders units, wherein:
- “M” sets of combined codes are generated by multiplying said first codes by “M” said second codes, wherein M is defined by (int (N/S)+1), where N is the total number of code used by all the mobile stations connected with a base station and S is the total number of said orthogonal codes;
- all the 1-st set to the (M−1)-th set of combined codes are allocated to the mobile stations;
- and
- spread spectrum signals with said combined codes are transmitted to said mobile stations.
Dependencies are inferred from the claim text.