50 results about "Capacity enhancement" patented technology

A method for communication over a wireless local area network (WLAN) includes receiving uplink signals from a plurality of stations in the WLAN. Responsively to the uplink signals, a set of the stations is selected for inclusion in a spatial multiplexing group. Downlink signals are transmitted simultaneously to the stations in the set using spatial division multiplexing (SDM).

With the addition of high-speed data traffic to traditional CDMA cellular networks, there is a need to efficiently utilize system capacity so that the quality of service of existing voice and low-speed data users is maintained while new high-speed data users are added to the network. Methods and systems are presented that control allocation of power to users, quality of service requirements, and / or user activity levels to enhance capacity utilization. These methods and systems are based on a method for estimating the capacity of a CDMA carrier with both voice and data users using an interference-based analysis of the reverse link. In particular, the methods enhance capacity utilization in a multi-code CDMA network architecture, in which several codes are allocated to a single high-speed data user for parallel transmission.

The present invention relates to a method and system for providing access to a cellular network (8), wherein a terminal device (1) is connected to an access device (2) according to access specifications of a broadband access network (12) which is not specifically designed to be used as a part of cellular network (8). The terminal device (1) indicates to the access device (2) that it wishes to be connected to the cellular network (8), and a session or call and a radio bearer is setup between the terminal device (1) and the cellular network (8). To achieve this, a service node (5) provided in the cellular network (8) requests a suitable access bearer from the access network (12) and the access device (2) sets up a corresponding access channel towards the terminal device (1). The terminal device (1) then associates the access channel to the correct radio bearer by using a corresponding identification. Thereby, service functions of the cellular network, e.g. UMTS services, can be distributed via any access network and existing broadband or high-speed access networks can be implemented in new cellular network structures. A huge capacity enhancement can thus be offered to the network operators of the cellular network without any standardization effort or license fee and at very small investment and maintenance costs.

A redundently modulated multicarrier protocol known as Carrier Interference Multiple Access (CIMA) is used in an optical-fiber network having wireless links at network nodes. CIMA is a protocol that can be used to create wireless protocols (such as TDMA and CDMA) having enhanced capacity and reduced system complexity. A CIMA optical-fiber network uses dispersion to enhance signal quality and facilitate switching. CIMA achieves both diversity benefits and capacity enhancements by providing redundancy in at least one diversity parameter while providing orthogonality in another diversity parameter. This basic operating principle of CIMA may be combined with multi-user detection to achieve frequency reuse and improved power efficiency. In the wireless link, diversity may be used to reduce the effects of small-scale fading on interferometry multiplexing.

A method and system for allocating air interface resources in a wireless telecommunications network. A control entity determines the current or projected location of a mobile station. Using the location, the control entity identifies the physical sectors and respective carrier frequencies available to serve the mobile station. The control entity then selects an optimal physical sector and respective carrier frequency and instructs the mobile station to operate in the selected physical sector using the selected carrier frequency.

A method for communication over a wireless local area network (WLAN) includes receiving uplink signals from a plurality of stations in the WLAN. Responsively to the uplink signals, a set of the stations is selected for inclusion in a spatial multiplexing group. Downlink signals are transmitted simultaneously to the stations in the set using spatial division multiplexing (SDM).

The present invention relates to a method, system and device for providing access from a terminal device (1) to a second access network (8). To achieve this an access network device (3) belonging to an first access network (12) stores a second access network information comprising information of second access network(s) (8) accessible from the first access network (12). Communication means between the terminal device and and the first access network are established and the second access network information is delivered to the terminal device (1). The terminal device (1) accesses the second access network (8) via the first access network (12). The accessing is done based on the second access network information delivered to said terminal device (1). Thereby, service functions of the second access network, e.g. UMTS services, can be distributed via any other access network and existing broadband or high-speed access networks can be implemented in new cellular network structures. A huge capacity enhancement can thus be offered to the network operators of the cellular network without any standardization effort or license fee and at very small investment and maintenance costs.

The number of users and data capacity of wireless systems are increased by employing apparatus and method for increasing the number of spreading codes available in the system by providing a mechanism to reuse the already allocated spreading code or use the codes that may correlate to those already being used within the same sector / cell. This, in return, provides capacity improvement proportional to the number of added base station (BS) antennas for each cell. An antenna null steering technique for code allocation maintains the cross correlation properties of the codes only for the desired user and to obtain a gain in capacity improvement.

A method for communication includes receiving signals transmitted over the air by first and second mobile stations on a common frequency channel in a wireless packet network, the signals carrying first and second data packets transmitted by the first and second mobile stations, respectively, the first and second data packets comprising respective, first and second headers. The received signals are processed so as to identify the first header. Responsively to the identified first header, signal values corresponding to at least a portion of the first data packet are reconstructed, and the reconstructed signal values are subtracted from the received signals so as to produce a modified signal. The modified signal is processed in order to identify the second header. The first and second data packets are demodulated using the identified first and second headers.

Adjunct apparatus for increasing network transmission capacity provides a low-cost, efficient solution for increasing the network transmission capacity of the existing telephone circuit switched network, while keeping the current network equipment unchanged. A Local Switch Network (LSN) Adjunct (LSNA) and a Tandem / Toll Switch Network (TSN) Adjunct (TSNA) interface with standard network elements, such as switches and cross connect equipment. These network adjuncts, comprising a set of low-bit rate speech coders, a dynamic timeslot manager and other supporting functions, advantageously transmit to and receive from a T1 / T3 / OC3 / E1 trunk. More than one channel of voice is carried on one 64 Kbps DS0 timeslot, while still maintaining the voice at toll quality. A sub-timeslot and sub-timeslot bundling are introduced in the standard T1 or E1 frame where each sub-timeslot is analogous to a single bit of the typical eight bit word to provide more than 24 or 30 voice channels respectively. Inband control information is generated for carrying over a T1 or E1 trunk, for example, for mapping sub-timeslot bundles to channels. Conventional out-of-band signaling is provided via SS-7 or other out-of-band signaling system.

A method for communication includes receiving signals transmitted over the air by first and second mobile stations on a common frequency channel in a wireless packet network, the signals carrying first and second data packets transmitted by the first and second mobile stations, respectively, the first and second data packets comprising respective, first and second headers. The received signals are processed so as to identify the first header. Responsively to the identified first header, signal values corresponding to at least a portion of the first data packet are reconstructed, and the reconstructed signal values are subtracted from the received signals so as to produce a modified signal. The modified signal is processed in order to identify the second header. The first and second data packets are demodulated using the identified first and second headers.

The present invention relates to a system and method for extending the coverage area and communication capacity of a spread-spectrum based wireless network through the use of intelligent repeaters. The system comprises a wireless communication network augmented with low cost channel selective repeaters that is capable of repeating only desired signals, thereby suppressing undesirable interference and increasing network capacity. The repeaters can be integrated into an existing wireless network with minimal impact to the existing network layer topology or control structure.

The use of a cellular system's packet data channel for transport of speech communications is enhanced by dynamically controlling the transmission of data packets that were received in error and notified to the transmitter by the receiver in accordance with an algorithm that takes into account a self-generated determination of the perceptual quality importance of the frame and is generated once for each frame by the speech encoder. The calculation of the frame importance is codec-dependent, and depends on a number of attributes associated with each particular frame, including the frame rate (for variable-rate codecs), signal classification, transition characteristics, background noise, previous frame erasures, etc. The selective reduction in transmission and retransmission increases the capacity of the cellular system while maintaining or even improving the quality of the received voice signal.

A system and methodology that facilitates adaptive link diversity for enhanced coverage and capacity during user data communication in a UMTS (Universal Mobile Telecommunications System) is provided. Specifically, current radio conditions associated with the user data are monitored and analyzed. Moreover, a switching and / or concurrent transport mechanism is implemented for communication between a NodeB and UE (User Equipment), when the current radio conditions change beyond a predefined level. In particular, a CS (Circuit Switched) over HSPA (High Speed Packet Access) connection is reconfigured to an R99 (Release 99) CS connection, or a concurrent R99 CS connection is provided along with the CS over HSPA connection, when detected that radio conditions have degraded beyond a predefined threshold. In one aspect, the selection between switching to a new transport mechanism and, adding a concurrent transport mechanism is based on an analysis and / or operator defined conditions.

A novel system is disclosed for WLAN applications. The inventive system mitigates the problem of interference by overlaying an omni-directional pattern with a plurality of directional beams, where each beam covers only part of the serving area defined by the omni-directional pattern. After an initial communication from the subscriber stations along the omni-directional pattern, the directional beam that provides the best signal quality is determined and the access point thereafter communicates with that subscriber station using only the beam with the best signal quality. The inventive concept can be expanded to encompass MIMO WLAN systems.

This invention discloses one read-write buffer storage device and the method of one storage device's read-write buffer to realize. This invention makes the reading buffer and the writing buffer separate, namely carries on the access control for reading buffer and writing buffer separately by the different processors, namely the reading buffer hangs directly under the main processor, thus enhances the processing efficiency of the main processor to the reading buffer, and the main processor can support the big memory space, thus guarantees the reading buffer have large capacity, then, improves the processing efficiency of the main processor to the reading buffer; The writing buffer hangs under the I / O processor, the I / O processor's necessary battery supply circuit realizes to supply the writing buffer power continually, and the writing buffer doesn't need to share the limited memory space the I / O processor can support with the reading buffer, thus the processing efficiency of the main processor to the writing buffer can be improved as a result of the writing buffer capacity enhancement.

The present invention relates to a system and method for extending the coverage area and communication capacity of a spread-spectrum based wireless network through the use of intelligent repeaters. The system comprises a wireless communication network augmented with low cost channel selective repeaters that is capable of repeating only desired signals, thereby suppressing undesirable interference and increasing network capacity. The repeaters can be integrated into an existing wireless network with minimal impact to the existing network layer topology or control structure.

The present invention relates to a method and system for providing access to a cellular network (8), wherein a terminal device (1) is connected to an access device (2) according to access specifications of a broadband access network (12) which is not specifically designed to be used as a part of cellular network (8). The terminal device (1) indicates to the access device (2) that it wishes to be connected to the cellular network (8), and a session or call and a radio bearer is setup between the terminal device (1) and the cellular network (8). To achieve this, a service node (5) provided in the cellular network (8) requests a suitable access bearer from the access network (12) and the access device (2) sets up a corresponding access channel towards the terminal device (1). The terminal device (1) then associates the access channel to the correct radio bearer by using a corresponding identification. Thereby, service functions of the cellular network, e.g. UMTS services, can be distributed via any access network and existing broadband or high-speed access networks can be implemented in new cellular network structures. A huge capacity enhancement can thus be offered to the network operators of the cellular network without any standardization effort or license fee and at very small investment and maintenance costs.

Adjunct apparatus for increasing network transmission capacity provides a low-cost, efficient solution for increasing the network transmission capacity of the existing telephone circuit switched network, while keeping the current network equipment unchanged. A Local Switch Network (LSN) Adjunct (LSNA) and a Tandem / Toll Switch Network (TSN) Adjunct (TSNA) interface with standard network elements, such as switches and cross connect equipment. These network adjuncts, comprising a set of low-bit rate speech coders, a dynamic timeslot manager and other supporting functions, advantageously transmit to and receive from a T1 / T3 / OC3 / E1 trunk. More than one channel of voice is carried on one 64 Kbps DS0 timeslot, while still maintaining the voice at toll quality. A sub-timeslot and sub-timeslot bundling are introduced in the standard T1 or E1 frame where each sub-timeslot is analogous to a single bit of the typical eight bit word to provide more than 24 or 30 voice channels respectively. Inband control information is generated for carrying over a T1 or E1 trunk, for example, for mapping sub-timeslot bundles to channels. Conventional out-of-band signaling is provided via SS-7 or other out-of-band signaling system.

The invention discloses a distance ratio based D2D (dimension to dimension) link spectrum allocation method, belonging to the technical field of wireless communication. The method disclosed by the invention is implemented through selecting a D2D link which carries out communication by using a cell uplink in a cell, firstly selecting a base station user according with distance-ratio conditions in the cell, and sharing the spectrum resources of the base station user with the D2D link; and if the spectrum can not be shared, separately allocating a spectrum to the D2D link. Through the method, the interference problem in a D2D system is solved, thereby obtaining the capacity enhancement and ensuring the reliable D2D communication; and meanwhile, the spectrum selection criteria of D2D links is greatly simplified, thereby helping a base station to rapidly complete the spectrum allocation of D2D links.

The invention discloses a method and apparatus for realizing almost blank subframe (ABS) configuration. The method comprises: an interference base station obtains ABS usage information sent by N base stations under interference; according to the ABS usage information, the number of configurable ABSs of the interference base station, and ABS adjusting states of the base stations under interference, the number of first configurable ABSs and the number of second configuration ABSs are determined; and the number of ABSs configured to the interference base station is determined based on the number of second configuration ABSs of the N base stations under interference and N interference levels. According to the embodiment of the invention, during the ABS adjustment process, the resource demands of the interference base station and the base stations under interference as well as the interference levels corresponding to the base stations under interference are taken into consideration, so that ABS configuration is balanced between the demand and the interference. Meanwhile, problems of long convergence time of ABS configuration and jittering existence are solved and the system stability is improved, so that objectives of edge user interference reduction, system performance improvement and throughput capacity enhancement can be achieved.

Push-to-talk messages are sent via a wireless multicast channel to multiple push-to-talk groups of devices regardless of group membership. Thus, all of the devices using the multicast channel receive all of the push-to-talk messages. To separate messages bound for one push-to-talk group from those bound for another, a push-to-talk group specific orthogonal code is applied to each message. The devices in a specific group use the group specific orthogonal code to decode the received multicast messages. If a device decodes the multicast message with the correct group specific orthogonal code, then the message is decoded and the device can play the message. If a device decodes the multicast message with a different group specific code (i.e., because it is not a member of the group the message was intended for), the message is will not be properly decoded and thus will be unplayable or scrambled.

The use of a cellular system's packet data channel for transport of speech communications is enhanced by dynamically controlling the transmission of data packets that were received in error and notified to the transmitter by the receiver in accordance with an algorithm that takes into account a self-generated determination of the perceptual quality importance of the frame and is generated once for each frame by the speech encoder. The calculation of the frame importance is codec-dependent, and depends on a number of attributes associated with each particular frame, including the frame rate (for variable-rate codecs), signal classification, transition characteristics, background noise, previous frame erasures, etc. The selective reduction in transmission and retransmission increases the capacity of the cellular system while maintaining or even improving the quality of the received voice signal.

Embodiments of the invention provide a carrier aggregation method based on sub-frame offset and a base station. A base station determines to perform sub-frame offset for newly added auxiliary carriers, and determines the sub-frame offset of the auxiliary carriers relative to a main carrier. Then, the base station configures an auxiliary carrier for each UE in a first UE set within coverage, and sends configuration information to each UE in the first UE set, wherein the configuration information includes the frequency of the auxiliary carrier, the sub-frame ratio of the auxiliary carrier and the sub-frame offset of the auxiliary carrier. According to the method, by setting sub-frame offset for an auxiliary carrier, the uplink sub-frames of the auxiliary carrier can be staggered from the uplink sub-frames of a main carrier or staggered from the uplink sub-frames of other auxiliary carriers, so that medium- and far-range users supporting carrier aggregation can be used on the uplink sub-frames of different carriers and can obtain the gain brought about by carrier aggregation, and the objectives of coverage and capacity enhancement are achieved.

The invention discloses an Ethernet transmission circuit. The Ethernet transmission circuit comprises a protocol conversion chip LAN8720A, an isolating transformer and an RJ45 interface, wherein the protocol conversion chip LAN8720A is connected with a filter circuit; an input end of the isolating transformer is connected with a pull-up resistor and a 3.3V power supply; an EMC (Electro Magnetic Compatibility) boosting circuit is arranged between the isolating transformer and the RJ45 interface; a protocol conversion chip LAN8720A filter network consisting of C22, C23, C24, C25, C26, C27, C28 and C29 is arranged, a drive capacity enhancement network consisting of R2, R3, R4 and R5 is arranged, a compatibility enhancement network consisting of R7, R8, R9 and R30 is arranged, and the effect of the isolating effect is combined, so the isolation and the compatibility are improved, the networking speed is improved, and the stability for work of an Ethernet unit is greatly enhanced.