43 results about "Spatial division multiple access" patented technology

The invention relates to a ground-based wireless cellular communication system (1a) for providing in-flight broadband mobile communication services, comprising: at least one ground-based base station (2) adapted for generating at least one cell (C1, C2) defining a solid angle of the space surrounding the base station (2), the ground- based base station (2) further comprising at least one antenna array (5a, 5a) using two-dimensional-beamforming for generating at least one beam (6a-c, 7a-c) for serving at least one airplane (8a-c, 8c-e) in the space covered by the at least one cell (C1, C2) using spatial-division multiple access, SDMA. The invention also relates to an airplane equipment for providing in-flight broadband mobile communication services, comprising: at least one antenna for exchange of user data with the ground-based wireless cellular communication system (1a), a transceiver unit connected to the at least one antenna for handling the air-to-ground and ground-to-air communication with the ground-based wireless cellular communication system (1a), and an inside-airplane communication system for distributing the user data to and from terminals within the airplane.

Some demonstrative embodiments of the invention include a method, apparatus, and system of performing simultaneous downlink transmission over a wireless medium to a plurality of wireless stations, using Spatial Division Multiple Access (SDMA) in a wireless local area network (WLAN). In one demonstrative embodiment of the invention, the method may include selecting a set of the plurality of wireless stations according to one or more ranking criteria; and reserving the wireless medium for a duration sufficient for completing the simultaneous downlink transmission to the wireless stations of the set. Other embodiments are described and claimed.

Methods and systems are provided for assigning channels in a spatial division multiple access communication network. The network includes a plurality of conventional channels some of which are configurable to be shared concurrently by plural subscribers. The method includes determining combinations of subscribers from the existing subscribers. Existing subscribers are reassigned to share channels thereby freeing resources for new subscribers.

Methods and systems are provided for assigning channels in a spatial division multiple access communication network. The network includes a plurality of conventional channels some of which are configurable to be shared concurrently by plural subscribers. The method includes determining combinations of subscribers from the existing subscribers. Enhancement activities are invoked to create optimal combinations of existing subscribers. Existing subscribers are reassigned as necessary to share channels thereby freeing resources for new subscribers.

An apparatus for scheduling uplink request spatial division multiple access (RSDMA) messages in an SDMA capable wireless LAN (304), including a processing system configured to receive requests for a spatial division multiplexed transmission from a plurality of nodes over a multiple access medium (312-1, 312-2, 312-3); and initiate the spatial division multiplexed transmission based on a metric related to one or more of the nodes (308), is disclosed. Another apparatus for wireless communications, including a processing system configured to generate data belonging to an access class having contention parameters; and precode at least a portion of the data for transmission over a spatial stream and enter into post backoff following the spatial stream transmission, is also disclosed. Methods for using the apparatuses are also disclosed.

A method and system for assigning unique words in an SDMA (spatial division multiple access) communication system is provided. A network management system logically arranges cell stations into clusters of stations, and monitors for a heavy traffic condition. Responsive to determining that a heavy traffic condition exists, the network management system may 1) redistribute unique words within a single cluster; 2) move one or more cell stations from a busy cluster to a less busy cluster; or 3) create a new cluster, and move cells from one or more busy cluster into the new cluster. In this way, the communication system continually adapts so that more unique words are made available at cell stations having heavier communication demands.

The invention discloses a resource layering method and device of a spatial division multiple access system. The method comprises the following steps of determining first class spaces, wherein users in the first class spaces are assigned to a same independent space, and the resource quantity needed by the users in the independent space is larger than a first threshold; determining second class spaces, wherein users in the second class spaces are assigned to a same independent space, and the resource quantity needed by the users in the independent space is smaller than the first threshold; distributing the first class spaces into a layer; combining the second class spaces to be a layer, wherein the resource quantity needed by the users assigned to the layer subjected to layering is smaller than a second threshold; and respectively layering the second class spaces which are not combined, wherein the first threshold is less than or equal to the second threshold. By utilizing the invention, the resource layering can be reduced and the times of resource reassortment by the users can be reduced when an assigning space is switched, therefore, the signalling overhead used for resource scheduling is reduced.

The invention discloses a method for allocating channels in a wireless communication station and a call access control method. In the invention, for each of a plurality of common channels, interference levels achieved by common channel assignment can be computed, which are functions of space feature of a user station which is communicated with a base station; and the interference levels responding the computation, which select the common channels from a plurality of common channels for assignment.

The invention discloses a super-cell SDMA (Spatial Division Multiple Access) method, and the method comprises the steps: firstly obtaining a CP excitation set of each user which is not dispatched; secondly determining the users with no intersection between the CP excitation sets of the users which are not dispatched as the SDMA users; and finally distributing the same time frequency resource or different time frequency resources to the SDMA users. The invention also discloses a super-cell SDMA base station. The method provided by the invention improves the SDMA probability and resource distribution flexibility.

The invention relates to a user grouping method, a device, a base station and a storage medium of space division multiple access. The user grouping method of SDMA comprises the following steps: receiving detection reference signals reported by at least two different user terminals; obtaining a channel estimation value of a channel in which the user terminal is located according to the detection reference signal; Calculating a correlation value representing a correlation between two different user terminals transmitting the detection reference signal according to the obtained channel estimationvalue; it is judged whether the data sent by the two different user terminals participating in the calculation is spatially multiplexed according to the calculated correlation value. The invention carries out space division multiplexing according to the correlation between different user terminals, and carries out space division multiplexing on the data sent by the user terminals with little correlation, so the the base station does not cause decoding error after space division multiplexing because the user terminals select orthogonal codes the interfere with each other, and the effective uplink flow in determining the bandwidth resources is improved.

The invention provides a space division multiple access method under a super cell. The method comprises the following steps: acquiring a sub-cell unit CP activation set of a terminal; dividing terminals with the CP number of 1 in the CP activation set into empty groups; grouping the terminals of which the CP number in the CP activation set is greater than 1 into frequency groups; controlling the terminals in the empty packets to be scheduled by the CPs to which the terminals belong, and scheduling the terminals in the frequency packets. The invention further provides a space division multiple access device under the super cell, electronic equipment and a computer readable medium.