A proposal for an RLC/MAC protocol for wideband CDMA capable of handling real time and non-real time services

Abstract

CDMA system. It makes the physical layer in the le bit rate services. In gned such that multiple the necessity to transmit the standardizatio an, ARIB, a concept of the Sequence (DS) CDMA has already been done pe and the US a lot of work challenge is to CO wireless system. D of services in one data and speech into one ques to mix a large variety e been investigated over the Besides Wideband C Access (PRMA) has a1 support mixed services combination of slotte investigated as a method to . In this method, based on a mobile stations. that there exists a major drawback of PRMA is problem. Since an MS has its own particular code, it can start transmitting any time, provided that there is enough capacity available of course. In this paper we will present a proposal of an RLCMAC protocol for the third generation system. It is based on the Wideband CDMA technology. The scope of the paper is limited to the uplink and user plane. We will shortly describe the proposed protocol architecture, followed by a short description of the physical layer. Then we will describe the RLC/MAC protocol.

An FDD wideband CDMA MAC protocol with minimum-power allocation and GPS-scheduling for wireless wide area multimedia networks

“…As a consequence, a variable-length packet is accommodated in a DCH channel. In order to simplify the segmentation of packets from the link access control (LAC) layer to the MAC layer, a fixedlength packet, called radio link control (RLC) packet data unit (PDU) as defined in [1], [14], is used. The size of the fixed-length RLC packet l r relates to the basic transmission rate r b of a DCH according to l r ¼ r b Á t fr , where t fr is the frame length.…”

“…In addition, the scheduling scheme for nonreal-time traffic is based on first-in first-out (FIFO) queueing and round-robin queueing. In [14], a proposal for an RLC/MAC protocol for wideband CDMA is presented. How to allocate resources to different services is not considered in this proposal.…”

A slotted CDMA protocol with BER scheduling for wireless multimedia networks

“…More recently, an interesting algorithm has been introduced for time-division multiple access (TDMA)-based networks to schedule transmissions based on different priority levels assigned to the different asynchronous transfer mode (ATM) service classes (i.e., the highest priority for constant bit rate (CBR) services), and on the delay constraints of each active connection [15]. For CDMA-based systems, new methods appeared in [16], [19], and [3]. While [16] and [19] are based on a CDMA scheme without a TDMA component, a hybrid multiple-access scheme is used in [3], similar to our protocol introduced in this paper.…”

“…For CDMA-based systems, new methods appeared in [16], [19], and [3]. While [16] and [19] are based on a CDMA scheme without a TDMA component, a hybrid multiple-access scheme is used in [3], similar to our protocol introduced in this paper. However, only traffic rate and delay constraints are considered in [3] to assign resources and users with different BER requirements will be spread over the same interval.…”

Hybrid type-II ARQ/AMS supported by channel predictive scheduling in a multi-user scenario

“…An obstacle in this context is the time-variability of the channel. To achieve a high system throughput also over fading channels, adaptive methods for the adjustment of the modulation alphabet and the coding complexity, together with time-slot scheduling, can be used [5][6][7]10]. In our previous publications [3,4], we describe two substantially different approaches to packet data transmission over fading channels, using adaptive methods for modulation and coding.…”