초록 ▼

A medium access controller for a multi-user network that assigns or changes the operating protocol of multiple upstream channels according to user loading, user status, and/or type of payload data transfers requested by the user or detected by the controller. One group of upstream channels utilizes

A medium access controller for a multi-user network that assigns or changes the operating protocol of multiple upstream channels according to user loading, user status, and/or type of payload data transfers requested by the user or detected by the controller. One group of upstream channels utilizes a contention-only protocol for non-responding or off-line users, a second group utilizes a limited type polling protocol for users requiring only brief transfers of payload data, and a third group utilizes an exhaustive polling protocol user requiring large amounts of payload data transfers. Limited type polling provides low latency for quick response to accommodate multiple users, while exhaustive polling provides large data throughput at the expense of latency. Additional levels of limited or exhaustive polling may be employed to accommodate a larger variety of users needs. In addition, the channels themselves may be dynamically reclassified between and among contention and first and/or other level polling modes based on user loading and/or the nature and character of on-going data transfers in order to achieve maximum utilization of shared resources. After initiating a data transmission, the controller may also dynamically assign channels to a user based on detected changes in actual data transmissions. Thus, rules based on user activity level may be implemented to determine when a user is switched between channel groups. Essentially, the controller may effect switching of the users' upstream channels dynamically and intelligently on a packet-by-packet basis. Users may include modems and/or other terminal devices in a client-server or other data communication network.

대표청구항 ▼

[ We claim:] [1.]1. A two way network communication system including a controller and plural client devices, said system comprising:a downstream medium over which said client devices receive data;an upstream medium including at least three upstream channels for conveying data from said client device

[ We claim:] [1.]1. A two way network communication system including a controller and plural client devices, said system comprising:a downstream medium over which said client devices receive data;an upstream medium including at least three upstream channels for conveying data from said client devicesone of said upstream channels operating in a contention mode, another of said upstream channels operating in a low-latency and yet another of said upstream channels operating in a burst mode, a relatively higher data throughput polling mode, wherein at least one of said channels is alterable between a polling mode and a contention mode;said controller being operative to assign to a client device any one of said at least upstream channels based on a bandwidth characteristic of payload data transferred by said client device.