Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-06-23
2001-09-25
Nguyen, Lee (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S417000, C455S452200, C455S524000, C455S525000
Reexamination Certificate
active
06295450
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to cellular communication systems and, in particular, to transferring a remote unit's communication among base stations within such cellular communication systems.
BACKGROUND OF THE INVENTION
Communication systems are well known and consist of many types including land mobile radio, cellular radiotelephone, personal communication systems, and other communication system types. Within a communication system, transmissions are conducted between a transmitting device and a receiving device over a communication resource, commonly referred to as a communication channel. To date, the transmissions have typically consisted of voice signals. More recently, however, it has been proposed to carry other forms of signals, including high-speed packetized data signals. For ease of operation, it is preferable to have the data transmission capability overlay the existing voice communication capability, such that its operation is essentially transparent to the voice communication system while still utilizing the communication resources and other infrastructure of the voice communication system.
One such communication system currently being developed with transparent data transmission capabilities is General Packet Radio Service (GPRS) system as described in the Global System for Mobile Communications (GSM) Technical Specification (TS) 2.60 and incorporated by reference herein. Within such a communication system a GSM communication system is overlaid with a GPRS communication system. In contrast to GSM's service model, which offers telephony on demand, GPRS's service model offers a wireless Wide Area Network (WAN) supporting a wide range of applications such as low-volume intermittent telemetry, video, web browsing, and the transfer of large amounts of data.
In such a system, each remote unit may have specific service requirements, which include the remote unit's requirements for the communications network to provide support for a certain call type (e.g. voice, video, data) and channel coding (e.g. full rate, half rate) as well as certain quality of service (QoS) parameters. (QoS parameters specify the remote unit's requirements for the network to support constraints such as bounded transfer delays and specified data throughput). In such a system, an active remote unit may be engaged in multiple calls of various or similar types, each call having various QoS parameters. Additionally, each base station may have specific capabilities that it is capable of supporting, (such as services needed to support a particular call type, channel coding services, and statically configured QoS classes). A base station will be configured to provide a set of QoS classes, however, at a specific point in time, a particular QoS class may not be available due to the varying demand on that base station for that QoS class. Thus, currently available QoS classes in a base station is dynamic while the set of QoS classes configured in a base station is static. Individual base stations may not be equipped with the capability to support a remote unit's specific service requirements. For example, some base stations may not have GPRS capabilities while their neighboring base stations are GPRS capable.
The current base station monitoring process in GSM/GPRS uses a static list of neighboring base stations to aid in transferring communication among base stations, which is described in detail in GSM recommendation 5.08. As described, the remote unit monitors all the base stations in a static list and reports measurements for a subset of the list having the best signal quality. Hence, base stations that may not satisfy a remote unit's service requirements are unnecessarily monitored and reported by the remote unit to its serving base station. Therefore, a need exists for a method and apparatus for transferring a remote unit's communication within a communication system that does not needlessly monitor and report neighboring base stations that do not satisfy a remote unit's service requirements.
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Deshmukh Jeetendra G.
Lyer Subramanian S.
Spear Stephen
Susai Antony D.
Haas Kenneth A.
Motorola Inc.
Nguyen Lee
Nguyen Simon
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