Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels
First Claim
1. In a system which supports code division multiple access communication among members of a first group of terminals and among a second group of terminals, a method comprising the steps of:
- assigning to the first group of terminals a first code, each user of the first group being uniquely identifiable by a unique code phase offset;
assigning to the second group of terminals the same code as used by the first group but each user of the second group using a common phase offset of that code; and
assigning to each user of the second group an additional code, the additional code being unique for each of the terminals of the second group.
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Abstract
A technique for allowing a first and second group of users to share access to a communication channel such as a radio channel. A first group of users is typically a legacy group of users such as those using digital CDMA cellular telephone equipment. The second group of users are a group of data users that code their transmissions in different formats optimized for data functionalities. The first group of users share one modulation structure such as, on a reverse link, using unique phase offsets of a common pseudorandom noise (PN) code. The second group of users share another modulation structure but in a manner that is consistent and compatible with the users of the first group. Specifically, the users of the second group may all use the same PN code and code phase offset. However, they are uniquely identified such as, for example, assigning each of them a unique orthogonal code.
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Citations
20 Claims
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1. In a system which supports code division multiple access communication among members of a first group of terminals and among a second group of terminals, a method comprising the steps of:
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assigning to the first group of terminals a first code, each user of the first group being uniquely identifiable by a unique code phase offset;
assigning to the second group of terminals the same code as used by the first group but each user of the second group using a common phase offset of that code; and
assigning to each user of the second group an additional code, the additional code being unique for each of the terminals of the second group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A wireless communication system comprising a first set of access units and a second set of access units, the first set of access units and the second set of access units capable of communicating with a central base station wherein the first set of access units use a chip rate scrambling code to separate their user channels, each individual unit of the first set of access units having at least one unique, non-orthogonal scrambling sequence that is selected from a unique phase shift of a longer pseudorandom noise sequence, and wherein the second group of access units share a common chip rate scrambling code that is not used by the first group of access units.
Specification