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Base station

About: Base station is a research topic. Over the lifetime, 85883 publications have been published within this topic receiving 1019303 citations. The topic is also known as: Mobile phone base stations & BS.


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Patent
Sandip Sarkar1
18 Feb 2004
TL;DR: In this article, a rate table (1000) is deployed, and a mobile station decreases or increases the transmission rate from one rate in the table to a lower or higher rate, respectively, in response to the busy signal.
Abstract: Techniques for congestion control are disclosed. In one embodiment, a base station allocates (350) a shared resource using a combination of zero or more individual grants and zero or more common grants, and generates a busy signal (370) in response to loading conditions that exceed a pre-determined level. In another embodiment, a subset of transmitting mobile stations reduce their transmission rate in response to a busy signal. The subset may include autonomous transmission, commonly granted transmission, individually granted transmission, or any combination thereof. In various embodiments, rate adjustment may be probabilistic or deterministic. In one embodiment, a rate table (1000) is deployed, and a mobile station decreases or increases the transmission rate from one rate in the table to a lower or higher rate in the table, respectively, in response to the busy signal. Various other aspects are also presented. These aspects have the benefit of providing efficient congestion control, avoiding excessive interference and increasing capacity.

142 citations

Patent
Akitaka Tomabechi1
22 Jul 1991
TL;DR: In this paper, a dynamic frequency allocation method of a digital, mobile, portable telephone system is proposed, where each base station uses a communication signal transmission channel including a frequency and a time slot pair respectively selected from a plurality of frequencies and a plurality time slots related thereto to implement a multichannel time division multiplex/time division duplex communication.
Abstract: A dynamic frequency allocation method of a digital, mobile, portable telephone system wherein in communications between a plurality of base stations which are connected to a public telephone network and/or a private branch exchange and which respectively generate synchronization in an independent manner and mobile stations receiving service therefrom, each base station uses a communication signal transmission channel including a frequency and a time slot pair respectively selected from a plurality of frequencies and a plurality of time slots related thereto to implement a multichannel time division multiplex/time division duplex communication. Each of the base and mobile stations receives a communication signal of a different station communicating with synchronization independent of the pertinent station by use of a different time slot at the same frequency of the channel used by the station to receive a communication sent thereto so as to measure an interval or a distance between the time slot used by the different station and the time slot assigned thereto. Based on the measurement result, a chance of a collision between these two time slots is estimated such that depending on the estimation result, the pertinent station detects free channels not being used by any other stations to conduct a channel transition to one of the detected free channels.

142 citations

Posted Content
TL;DR: This work derives the optimal power allocation for the DF strategy and finds that the RF strategy is always better than the DF to enhance secure connection and shows that without relay, it is difficult to establish secure connections from the base station to the cell edge users.
Abstract: This work studies the problem of secure connection in cooperative wireless communication with two relay strategies, decode-and-forward (DF) and randomize-and-forward (RF). The four-node scenario and cellular scenario are considered. For the typical four-node (source, destination, relay, and eavesdropper) scenario, we derive the optimal power allocation for the DF strategy and find that the RF strategy is always better than the DF to enhance secure connection. In cellular networks, we show that without relay, it is difficult to establish secure connections from the base station to the cell edge users. The effect of relay placement for the cell edge users is demonstrated by simulation. For both scenarios, we find that the benefit of relay transmission increases when path loss becomes severer.

141 citations

Journal ArticleDOI
TL;DR: In this paper, radio resource allocation in a heterogeneous wireless access medium is studied and a novel algorithm is developed, such that each network base station / access point can perform its own resource allocation to support the MTs according to their service classes.
Abstract: In this paper, radio resource allocation in a heterogeneous wireless access medium is studied. Mobile terminals (MTs) are assumed to have multi-homing capabilities. Both constant bit rate and variable bit rate services are considered. A novel algorithm is developed for the resource allocation. Unlike existing solutions in literature, the proposed algorithm is distributed in nature, such that each network base station / access point can perform its own resource allocation to support the MTs according to their service classes. The coordination among different available wireless access networks' base stations is established via the MT multiple radio interfaces in order to provide the required bandwidth to each MT. A priority mechanism is employed, so that each network gives a higher priority on its resources to its own subscribers as compared to other users. Numerical results demonstrate the validity of the proposed algorithm.

141 citations

Patent
12 May 2009
TL;DR: In this paper, the location and orientation of the remote station are determined based on the magnitude, amplitude, and/or phase of magnetic field signals received on each of the transducers.
Abstract: A base station (e.g., a central device including a transducer assembly of one or more orthogonal transducers) transmits a magnetic field at a known power level and direction. The magnetic field signal includes data information transmitted from the base station to a movable remote station. The remote station includes a transducer assembly of one or multiple transducer coils to receive the magnetic field generated by the base station. Location and orientation of the remote station (with respect to the base station) are determined based on the magnitude, amplitude, and/or phase of magnetic field signals received on each of the remote station's transducers. The remote station may transmit the location and orientation information (e.g., raw measured data or converted data) to the base station using the same coils as used by the remote station to receive the magnetic field generated by the base station.

141 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,277
20222,829
20211,823
20203,484
20194,001
20184,426