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Wireless telecommunications system utilizing CDMA radio frequency signal modulation in conjunction with the GSM A-interface telecommunications network protocol
| Details |
Inventors: Spartz, Michael K.; Agre, Daniel H.; Robbins, Barry R.;
Assignee:
Primary Examiner: Hsu; Alpus H.
Assistant Examiner:
Attorney, Agent or Firm: Miller; Russell B., Edmonston; Brian S., Rouse; Thomas R.
A method and apparatus for operating a wireless telecommunication system utilizing code division multiple access (CDMA) over-the-air with a Global System for Mobile communications (GSM) A-interface based network is described. A CDMA radio frequency (RF) signal interface provides a bi-directional interface to a subscriber unit, and a Global System for Mobile (GSM) communications A-interface SS7 transport provides a bi-directional interface with GSM mobile services switching center (MSC). Additionally, a transparent message transport is provided over which signaling messages defined in the GSM A-interface protocol are exchanged between the GSM MSC and a subscriber unit. Other signaling message generating by the GSM MSC and subscriber unit are processed and various actions are taken in response, including the configuration and control of signal processing resources. This configuration and control includes the allocation of vocoding and devocoding resources in accordance with the requested type of service, and the invocation of CDMA based encryption capabilities. Other actions include the allocation of CDMA traffic channel processing resources and selection resources at the start of a signaling exchange between the subscriber unit and the BSS or MSC. These resources process both voice and data calls, and signaling messages, such as registrations, from the subscriber unit. The CDMA traffic channel resources are used to perform the IS-95 style CDMA signal processing functions including modulation and demodulation. |
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DETAILED DESCRIPTION A method and apparatus for operating a wireless telecommunication system utilizing CDMA over-the-air with a GSM A-interface based network is described.
By utilizing the GSM A-interface standard, which is defined in the GSM specifications as the interface between the GSM MSC and the BSS, the CDMA wireless telecommunications system can be implemented using a GSM MSC conforming to the GSM specifications.
This allows CDMA wireless cellular telephone service to be provided using some of the existing operating GSM network infrastructure.
In the preferred embodiment of the invention, the CDMA based BSC communicates to the GSM MSC via the A interface as it is specified in the existing GSM standards.
However, other embodiments of the invention may use modifications to the defined GSM A interface to enhance system operation and functionality.
In accordance with one embodiment of the invention, the BSS and subscriber units interface via the use of radio frequency signals physically modulated in accordance with CDMA techniques.
In the preferred embodiment of the invention, the CDMA modulation techniques are substantially similar to those incorporated in the IS-95 wireless telecommunications protocol previously referenced.
A high level diagram of the functional elements used to interface a subscriber unit and a GSM MSC, in accordance with one embodiment of the invention, is illustrated in FIG.
2.
During operation of the system, CDMA RF interface 40 provides a bi-directional interface to subscriber unit 50, and GSM A-interface SS7 transport 42 provides a bi-directional interface with GSM MSC 52.
Establishing the CDMA over-the-air interface and use of transparent signaling transport 44 allows the signaling messages defined in the GSM A-interface protocol to be exchanged between GSM MSC 52 and subscriber unit 50.
Processing and service conversion 46 receives and examines certain signaling messages from CDMA RF interface 40 and GSM A-interface SS7 transport 42 and takes various actions in response, including the configuration and control of signal processing resources 48
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Cell Phones 
