Method and apparatus for transmission rate modification of communication channels
A technology of transmission rate and transmission probability, which is applied in the field of resource allocation in multiple access connection systems, and can solve problems such as algorithm complexity, consumption of base station resources, consumption of reverse link resources, etc.
Inactive Publication Date: 2007-04-11
QUALCOMM INC
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Problems solved by technology
For example, using Access-Request messages consumes valuable reverse link resources
Additionally, the transmission of data on the reverse link is delayed while the remote unit and base station negotiate the data rate
Furthermore, the algorithms that must be used by the base station to respond to access request messages from multiple remote units complicate and consume considerable base station resources
Method used
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[0021] In multiple access systems with limited resources, a means of controlling reverse link loading is required in order to avoid unstable system behavior. In systems where the remote unit is capable of transmitting at multiple data rates, the reverse link load can be controlled by adjusting the data rate at which the remote unit transmits. For example, in a system where external and mutual interference levels allow 30 remote units to simultaneously access the system at a given data rate, the same system could allow 60 remote units if each transmits at half the given data rate. The end units are connected to the system at the same time. If some of the remote units transmit at half the given data rate, the system can accommodate between 30 and 60 users simultaneously. Under actual operating conditions, the capacity of the system is soft-limited in that each remote unit added to the system reduces the signal quality at which every other system user operates. The capacity is ...
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A method of accessing a system utilizing multiple data rates. The method includes determining a desired transmission data rate and setting a current data transmission rate to the desired transmission data rate if the desired rate is less than a maximum transmission rate. The current data transmission rate is set to the maximum transmission rate with a probability equal to a transmission probability if the desired transmission rate exceeds or is equal to the maximum transmission rate. Also described is a multiple access communication system including a base station which uses an indication of system loading to determine a transmission probability and a maximum transmission rate for the system and broadcasts the transmission probability and the maximum transmission rate to a plurality of remote units. A remote unit transmits data to the base station at the maximum transmission rate with the transmission probability. A multiple access communication system may include a receiver for receiving a maximum transmission rate and a transmission probability produced by a base unit, a process for determining a desired transmission data rate, a process for setting a current data transmission rate equal to the desired transmission data rate if the desired rate is less than a maximum transmission rate, and a process for setting the current data transmission rate to the maximum transmission rate with a probability equal to the transmission probability if the desired transmission rate exceeds or is equal to the maximum transmission rate. A transmitter transmits data to the base unit at the current data transmission rate.
Description
Background of the invention [0001] I. Field of Invention [0002] The present invention relates to communication systems. In particular, the invention relates to resource allocation in multiple access systems. [0003] II. Description of related technologies [0004] FIG. 1 is an example embodiment of a terrestrial wireless communication system 10 . FIG. 1 shows three remote units 12 , 13 and 15 and two base stations 14 . In fact, a typical wireless communication system has many more remote units and base stations. In FIG. 1, the remote unit 12 is shown as a mobile telephone unit installed in an automobile. Figure 1 also shows a fixed location remote unit 15 in a wireless local loop system and a portable computer remote unit 13 in a standard cellular system. In most general embodiments, the remote unit can be any type of communication unit. For example, the remote unit may be a hand-held personal communication system (PCS) unit, a portable data unit such as a personal d...
Claims
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IPC IPC(8): H04Q7/38H04L29/08H04L12/70H04W28/18H04W28/22H04W72/04
CPCH04W48/16H04L2012/5632H04W28/22H04W28/18
Inventor 小E·G·蒂德曼周渔君林育全
Owner QUALCOMM INC